Sony Ericsson T200 Quick reference guide

July, 2002
T200/T202

Contents
Preface ............................................................................................................... 5
Purpose of this document ......................................................................... 5
Product overview ............................................................................................... 5
Key functions and features ........................................................................ 5
Functions and features for productivity ..................................................... 7
Extras for fun ............................................................................................. 7
Messaging .......................................................................................................... 8
EMS — Enhanced text messaging .............................................................. 8
Mobile chat ................................................................................................ 8
WAP services ..................................................................................................... 9
Bearer type characteristics ...................................................................... 10
Security using WAP ................................................................................. 10
Configuration of WAP settings ................................................................ 11
Push services ........................................................................................... 11
Over-the-air provisioning of WAP settings .............................................. 11
Mobile Internet ................................................................................................. 12
Data connections ..................................................................................... 12
Mobile positioning ................................................................................... 13
General Packet Radio Services ........................................................................ 13
Using GPRS in the T200/T202 ................................................................. 14
Modem and AT commands .............................................................................. 15
GSM data communication ....................................................................... 15
GPRS enables constant connection ........................................................ 15
In-phone functions and features ...................................................................... 16
In-phone functions and features ...................................................................... 16
Network-dependent features ................................................................... 18
SIM application toolkit ...................................................................................... 19
SIM AT services supported by the T200/T202 ........................................ 19
User interaction with SIM AT ................................................................... 22
Chinese version ................................................................................................ 23
Terminology and abbreviations ........................................................................ 24
Related information .......................................................................................... 27
Documents ............................................................................................... 27
Links ......................................................................................................... 27
Trademarks and acknowledgements ...................................................... 27
Technical specifications ................................................................................... 28
General .................................................................................................... 28
Exterior description .................................................................................. 28
Ambient temperatures ............................................................................. 28
Supported Man-Machine Interface (MMI) languages .............................. 29
Talk and standby times ............................................................................ 31
Speech coding ......................................................................................... 31
Performance and technical characteristics ............................................. 32
WAP browser technical data ................................................................... 32

GPRS technical data ............................................................................... 34
Built-in GSM data modem technical data ............................................... 34
Cell broadcast service ............................................................................. 35
Short message service ............................................................................ 35
Instant messaging/Chat .......................................................................... 37
Consumer pack includes: ........................................................................ 37

T200/T202
White Paper
5
Preface
Purpose of this document
The Sony Ericsson T200/T202 White Paper is
designed to give the reader a deeper technical
understanding of how the T200/T202 is designed,
and of how it interacts with other media. This doc-
ument will make it easier to integrate the T200/
T202 with the IT and communications solutions of
a company or organization.
People who can benefit from this document
include:
• Corporate buyers
• IT professionals
• Software developers
• Support engineers
• Business decision-makers
More information, useful for product, service and
application developers, is published on the Sony
Ericsson Mobilityworld. The site at http://
www.ericsson.com/mobilityworld/ contains up-to-
date information about technologies, products
and tools.
Product overview
The T200/T202 is a dedicated mobile Internet
phone. One long press on the Access key and the
user is instantly connected to news, entertain-
ment and e-shopping. A WAP 1.2.1 browser
makes Internet connection available and safe, and
GPRS makes it fast.
With its built-in antenna, round shapes and a large
display, the T200/T202 has a smooth design that
fits perfectly in the hand.
The T200/T202 will be available on all GSM 900,
1800 and 1900 markets in the 2nd quarter of
2002.
For a list of the Chinese version features, see
“Chinese version” on page 23.
Key functions and features
One-button access to the mobile Internet
With the T200/T202, the mobile Internet is always
at hand. One long press on the Access button and
you are there — instantly. The T200/T202 takes
care of the connection so that users can concen-
This document is published by Sony
Ericsson Mobile Communications AB,
without any warranty.
Improvements and changes to this text
necessitated by typographical errors,
inaccuracies of current information or
improvements to programs and/or
equipment, may be made by Sony
Ericsson Mobile Communications AB at
any time and without notice. Such
changes will, however, be incorporated
into new editions of this document. Any
hard copies of this document are to be
regarded as temporary reference copies
only.
This White Paper is published by:
Sony Ericsson Mobile Communications
AB, SE-221 88 Lund, Sweden
Phone:[phone]
Fax: [phone]
www.SonyEricssonMobile.com
First edition (July, 2002)
Publication number: EN/LZT 1085818

6
T200/T202
White Paper
trate on what they are looking for — news, enter-
tainment or the latest fashionable sites.
The Access key is assigned to a WAP address.
The default address for non-customized products
is the address for Sony Ericsson Mobile Internet.
This address can be changed by the user.
Sony Ericsson customers can choose to have the
address to their own WAP site assigned instead.
The Access key is also an option key. This key
gives you the most common options for the func-
tion currently in use.
GPRS
The success of the mobile Internet is dependent
on a wide range of services, easy-to-use prod-
ucts, large displays and speed. The T200/T202 is
a GPRS phone, supporting GPRS 3+1 timeslots.
Consequently, by receiving data on 3 radio chan-
nels, the speed can be up to 43.2 kbps when
browsing the mobile Internet. Basically, this is as
fast as the modem many people have at home
today when using their PC for browsing the Web.
In short, GPRS…
• Uses Internet-style packet based technology.
• Lets you stay permanently connected to the
mobile Internet, but only uses the radio link
for the time it takes to transfer data (you only
pay for what you get).
• Gives you constant connection with speedy
data transfer.
• Allows you to receive calls and messages
during GPRS activities without interrupting
the transmission. The data session is simply
paused while the call is in progress.
Secure WAP
M-commerce is expected to be a growing part of
the mobile Internet. Trading, banking and shop-
ping have been possible via the Internet for quite
some time, building upon the foundation of the
built-in security features. It is these features that
have been adapted to and implemented in the
WAP protocol and the layer called WTLS, Wireless
Transport Layer Security. WTLS consists of three
security classes, where class 3 provides the high-
est security.
The T200/T202 supports WAP 1.2.1, the latest
version of the Wireless Application Protocol that
includes WTLS class 3. With the most advanced
version of WTLS, full security is guaranteed when
trading, banking or shopping online. WTLS class
3 includes the following security features:
• Encryption of a message, ensuring that only
the sender and the recipient can read the con-
tents of a message.
• Server authentication, meaning that the mes-
sage is encrypted and users can verify that
they really are communicating with the WAP
gateway they believe they are connected to.
• Client authentication, ensuring that users are
who they claim to be.
Messaging — EMS and Mobile chat
EMS lets users send black and white pictures,
animations, sound effects, ring signals and for-
matted text to each other. With Mobile chat, text
messaging is made easier since a chat session
opens up immediately when a text message is
received from a phone.
T9™ Text Input for quicker messaging
The T200 supports the predictive text input
method T9™ Text Input. Predictive text input
makes it fast and easy to write text messages. It
works by searching a word database to anticipate
which word you are writing. You only have to
press each key once, even if the letter you want is
not the first letter on the key. You can also add
new words to the database.

T200/T202
White Paper
7
Functions and features for
productivity
The phone book
The phone book is one of the most used features
of mobile phones. That is why a lot of work has
been put into developing a phone book that is
easy to use and offers quick access. The phone
book in the T200/T202 lets you save up to 250
contacts.
Short-cuts
It is easy to access contacts in the phone book
when you make a call. Just press and hold down
the button with the letter that the name you are
looking for starts with. You instantly enter the
phone book and find the first name that starts
with that letter. Then you just scroll to find the
name you are looking for.
Picture phone book - see who's calling
The T200/T202 lets you assign a picture or an
icon stored in the phone to an entry stored in the
phone book. When a person calls or sends an
SMS, a picture or an icon of your choice will be
shown in the display as well as the name. You can
also assign a ring-signal to an entry in the phone
book. When a person calls or sends an SMS, that
particular ring-signal will be heard, together with
the name in the display.
The pictures used for Caller ID can be…
• Any of the EMS pictures stored in the phone
from the start
• Pictures that have been received via EMS
messages
• Any operator defined picture.
Naturally, the T200/T202 also supports name and
number presentation as well as CLI restriction. It
also allows the user to assign a ring signal to a
certain number in the phone book.
Up-to-date with the calendar
The calendar of the T200/T202 keeps the user on
the right track. It has two different views: month
and week. and an appointment view. It also sup-
ports week numbering.
Option key
The Access key is also an option key. This key
gives you the most common options for the func-
tion currently in use.
Profiles
The profile feature: a group of settings preset to
suit a certain environment. The profiles are also
related to intelligent accessories such as a desk-
top charger, a portable or vehicle handsfree; use-
ful for company integration with call forwarding
etc. Some phone accessories select a profile
automatically. For example, when you place your
phone in a car handsfree unit, the “In car” profile
is chosen. There are seven pre-programmed pro-
files: Normal, Meeting, In car, Outdoors, Port h-
free (portable handsfree), Home, Office.
You cannot create more profiles, but you can
change the settings for a profile. A profile with no
accessories associated, such as Meeting or Nor-
mal, must be chosen manually.
Accessories
A wide range of Sony Ericsson accessories are
available, such as ComuniCam MCA-10, MP3
Handsfree HPM-10, to enhance productivity fur-
ther.
Services on the network
The T200/T202 supports the SIM Application
Toolkit (online services), which makes it possible
for operators to provide new services to existing
users over the air, including new menus and func-
tions in the phone.
Triple band support
Dual band support means that you can use the
phone on GSM 900, 1800 and1900 networks.
Extras for fun
Background pictures
The user can have a background picture in the
display, to bring extra life to the phone when it is
in standby mode. The background pictures can
be one of six pre-defined, replaceable pictures or
an operator defined picture
It is also possible to use a Sony Ericsson's RS
232 Cable or USB Cable to transfer content to the
phone from the My Animation PC software, found
at http://www.SonyEricsson.com/.
Start-up and shutdown shows
Another way to make the T200/T202 more per-
sonal is to have a user-defined start-up and shut-
down show. Every time the phone is turned on or
off, an animation, with or without sound, appears
in the display. There is one Sony Ericsson-defined

8
T200/T202
White Paper
show and one operator-defined show stored in
the phone. As with the background picture, the
user-defined show can use any of the EMS pic-
tures or it can be a show downloaded to the
phone via an RS232 Cable or USB Cable from the
My Animation software, found at http://
www.SonyEricsson.com/.
Games
For some people, playing a game is a good way
to relax. The T200/T202 includes games for differ-
ent moods and skills.
Ring signals
There are four ways to find a catchy ring signal for
the T200/T202. One way is to choose any of the
pre-programmed ring signals in the phone.
Another way is to compose up to eight new ring
signals and choose one of them. It is also possible
to download a ring signal from a WAP site or
receive a catchy tune in an EMS message from a
friend or a company that sells ring signals.
Messaging
More than 15 billion text messages are sent
world-wide between mobile phones each month
(January, 2001). The consumers’ needs to express
themselves in ways beyond voice were highly
underestimated by the industry when SMS was
introduced in the late 90s. The success of SMS,
however, is the springboard for existing and com-
ing messaging services, such as Enhanced Mes-
saging Service (EMS) and Mobile chat.
EMS — Enhanced text
messaging
EMS lets users send greyscale pictures, anima-
tions, sound effects, ring signals and formatted
text to each other. EMS is based on SMS text
messaging and is a GSM standard developed by
3GPP, Third Generation Partnership Programme.
Unlike Nokia's Picture Messaging, EMS works
with phones that do not support EMS, simply by
allowing the receiving phone to ignore the EMS
items and only display the text.
The T200/T202 supports most of the features
specified in the EMS standard. It has a number of
pre-defined EMS pictures stored in the phone,
plus space for user-defined pictures that can be
sent to other phones in EMS messages. More-
over, there are pre-programmed animations and
sound effects that can be used to enhance a mes-
sage and make it more personal.
Mobile chat
Mobile chat is an SMS-based chat function,
which is different from ordinary SMS messages in
that the old messages stay in the display, similar
to chat sessions on the Internet. Each writer is
distinguished by a nickname.
Mobile chat makes text messaging easier since a
chatsession opens up immediately when a text
message is received from a phone. Chat sessions
are automatically saved for an hour, letting the
user resume the communication when inter-
rupted. The Mobile chat function works with
phones made by other manufacturers.

T200/T202
White Paper
9
WAP services
The typical WAP client is a small, portable device
which is connected to a wireless network. This
includes mobile phones, pagers, smart phones,
PDAs and other small devices. In these devices,
you have a limited user interface, low memory and
computing power compared to desktop and lap-
top computers.
The WAP browser in the T200/T202 is compliant
with WAP 1.2.1, including security according to
WTLS class 3. It is designed for WML and cannot
read ordinary HTML pages, but it is suitable for
interaction with customer services, e. g. ticket
reservation. It is also handy when you want to
access text-based information, such as timeta-
bles, share prices, exchange rates, Internet bank-
ing and other interactive services.
Using WAP in the T200/T202
The built-in WAP browser gives the user portable,
fast and secure access to a wide variety of ser-
vices, with the possibility of personalized ser-
vices. WAP in the T200/T202 offers new
opportunities to companies and service providers:
Push service
A useful feature for companies and service pro-
viders to push contents or service indications to
work groups or customers. This is used for notifi-
cations, mail alerts, messaging, news, stock
quotes, contacts, meeting requests, games etc.
Provide settings
Using SMS messages, configuration settings can
be sent over the air, OTA, so that the user does
not need to configure the WAP access settings
manually. WAP settings may also be customized
by the operator.
Adapt to phone type
When creating a WAP service, you want to make
sure that the user experience is what you intend,
regardless of client device type. The function User
Agent Profile is supported by the T200/T202 to
allow the contents to be automatically optimized
for the phone.
Several bearer types
The T200/T202 accesses WAP over a standard
GSM Data connection as well as over a GPRS
connection. SMS is available as bearer type also.
(Network-dependent services.)
Options button
During WAP browsing, the options button on the
T200/T202 gives the user immediate access to a
dynamic option menu when using WAP services,
similar to a mouse right-click in PC programs.
Bandwidth efficiency
One of the key advantages WAP has over text-
based HTML pages on mobile devices, is the
bandwidth efficiency for communication. This is
due partly to the fact that the WAP application is
communicated to the wireless devices in the form
of binary encoded data. Over a GPRS connection,
bandwidth is used even more efficiently.
Easy create for WAP
Creating a WAP service is no harder than creating
an Intranet/Internet service today since WML and
WMLScript are based on well-known Internet
technology. New market segments can be
addressed by launching innovative mobile Value
Added Services.
Using standard tools
It is possible for the service creator to use stan-
dard tools like ASP or CGI to generate content
dynamically. You can utilize existing investments
in databases etc. that are the basis of existing
Internet services. Create a service once and make
it accessible on a broad range of wireless net-
works.
Maintain customer base
You can adapt existing Internet services to WAP.
The actual binary encoding can be handled by the
WAP Gateway which makes it possible to create
WAP applications using the text-based language
WML and other tools. In fact, existing HTML-
based applications on the Internet can be viewed
in the WAP browser, if an automatic conversion is
performed in the WAP Gateway.
Improve productivity
Improve and simplify the communication flow
within an organization by making information
available to mobile users. A company or organiza-
tion can use a WAP gateway to provide a secure
connection to the company network for their
users.

10
T200/T202
White Paper
The WAP profiles
The T200/T202 holds a number of WAP profiles,
each with a group of network settings and a home
page. If you provide a corporate WAP service on
your Intranet, it is useful to enter an Intranet WAP
profile in user phones. The WAP profile holds net-
work settings and user identification. Users can
switch easily between corporate services and
WAP services on the Internet, simply by switching
WAP profile.
Bearer type characteristics
The phone accesses WAP services over SMS or
IP, where IP can be provided either over GSM
Data or GPRS, depending on network services.
Typical differences which distinguish the bearer
types are listed below.
GPRS access
• Connection is maintained “constantly”, as
required by the application, and data is trans-
mitted in packets. This means that the phone
is connected almost all the time without using
network capacity.
• Higher transmission speed than with GSM
Data and SMS access.
• Pricing of GPRS can be dependent on the
actual use of bandwidth, which means very
low cost when no data is sent or received,
while the phone remains connected to the
WAP service.
• When transmitting large amounts of data,
bandwidth can be increased automatically to
allow faster transmission speed.
• GPRS is ideal for Complex Pull services,
Browsing, Data transfer, Provisioning, Pager
service, Messaging services, Info services,
Push initiations.
GSM data access
• Circuit connection of data call, which means
that the phone is connected during the entire
WAP session.
• Comparably higher transmission speed than
with SMS access.
• Pricing of GSM Data access can be com-
pared to pricing of data calls in the network.
• GSM Data is suitable for Complex Pull ser-
vices, Browsing and Data transfer.
• GSM Data is not suitable for Provisioning,
Pager service.
SMS access
• SMS point-to-point is used and not SMS Cell
Broadcast.
• Connection is maintained by the automatic
exchange of ”messages” between the phone
and the SMS Service Centre.
• Comparably lower transmission speed than
with GSM Data access.
• Pricing of SMS access can be compared to
pricing of the normal SMS service in the net-
work.
• MS is suitable for Messaging services, Info
services, Push initiations, Provisioning.
• MS is not suitable for Browsing, Data transfer.
The WAP Gateway provides services in the com-
pany’s Intranet, a banking or stock trading service
on the Internet, or access to other WAP applica-
tions on web addresses anywhere on the Internet.
A Gateway is identified by an IP number or by a
phone number, depending on access type.
Security using WAP
The T200/T202 supports WAP 1.2.1, a version of
the Wireless Application Protocol that includes
WTLS class 3.
When using certain WAP services,the user may
want more security than normal, for example
when using banking services.The user establishes
a secure connection between the phone and the
WAP gateway.
To use such connections, certificates have to be
saved in the phone.The certificates are made
available so that users can download them from
certain WAP sites. An access key is needed when
accessing certain WAP sites or when reviewing
certificates.The user is asked to enter it before a
secure WAP connection is established.
WTLS class 3 includes the following security fea-
tures:
• Encryption of a message, ensuring that only
the sender and the recipient can read the con-
tents of a message.
• Server authentication, meaning that the mes-
sage is encrypted and users can verify that
they really are communicating with the WAP
gateway they believe they are connected to.
• Client authentication, ensuring that users are
who they claim to be.

T200/T202
White Paper
11
Configuration of WAP
settings
An easy way to perform the WAP configuration of
a single phone is by using the step-by-step WAP
configurator provided on the Sony Ericsson
Mobile Internet. The configurator utilizes OTA pro-
visioning, and it is available on http://
www.SonyEricsson.com, no login required.
A manual configuration is made using the menu
system in the phone. This is described in the
User’s Guide.
Push services
These are useful for sending updated WAP site
contents or WAP links to mobile users. Examples
of services that can be implemented using push
services:
• Notification of new voice mails, etc. Instant
messaging and chat.
• News, sport results, weather forecasts, finan-
cial information (stock quotes etc).
• Personal Information Manager (PIM) - delivery
of contacts, meeting requests etc.
• Fill up a smart card with e-cash.
• Interactive games, e.g. play poker with a
friend.
In the T200/T202, the user selects whether to
allow push messages or not. There are two differ-
ent forms of Push services:
Service Indication (SI)
This is basically a text message to the user con-
taining a link to a URL carried by the SI. If the
user decides to load the suggested URL, normal
WAP browsing commences.
Service Loading (SL)
This means that the WAP site content is immedi-
ately loaded and executed on the client, or alter-
natively is loaded and stored in the cache for later
use. In both cases, the SL is loaded without any
user intervention.
When a service indication is received in the T200/
T202, it is presented to the user in one of the fol-
lowing ways:
•High
Immediately displays the message irrespec-
tive of current activity.
•Medium
Message is immediately displayed, unless the
user is engaged in another activity. In this
case the message is indicated to the user,
who retrieves it later from the inbox.
•Low
Message is not immediately displayed.
Instead it is put in the Inbox, and an indication
is given in the standby screen.
In the T200/T202 push message inbox, a list
shows the first part of each received message,
newest first. The user decides to read or delete
the message, and whether to load the suggested
URL in the WAP browser.
Over-the-air provisioning of
WAP settings
To simplify configuring WAP settings in a number
of phones, all settings can be sent as an SMS
message to each phone. This makes it easy for an
operator, a service provider or a company to dis-
tribute settings for Internet/Intranet, and WAP,
without having to configure each phone manually.
This also makes it easy to upgrade the services
provided to the users, without the need for users
to perform any manual configuration.
• The OTA configuration message is distributed
via SMS point-to-point.
• The setup information is a binary encoded
XML message, according to WBXML. To
receive information about OTA specifications,
please contact your local Sony Ericsson rep-
resentative for consumer products. A config-
urator that utilizes OTA provisioning can be
tested on Sony Ericsson Mobile Internet.
• The user is not alerted about new settings
until the ongoing browsing session ends. Fur-
thermore, settings are not changed during an
ongoing browsing session.
• The necessary user interaction is limited to
receiving and accepting/rejecting the configu-
ration message, and selecting which WAP
profile to allocate the settings to.
• Security can be handled using a keyword
identifier displayed on the screen as a shared
secret between the SMS sender and recipi-
ent. It is important that the user can verify that
the configuration message is authentic.

12
T200/T202
White Paper
Mobile Internet
The Mobile Internet offers much more than mobile
access to the Internet — it opens up a whole new
range of situation-based services. Services that
give us access to personalized communications,
information and entertainment anytime, anywhere.
With the T200/T202, the mobile Internet is always
with you. One long press on the Access key and
you’re there — instantly. The Access key is
assigned to a WAP address. The default address
for non-customized products is the address for
Sony Ericsson Mobile Internet. This address can
be changed by the user. Sony Ericsson customers
can choose to have the address to their own WAP
site assigned instead.
The T200/T202 also enables new technologies
such as mobile positioning to create new com-
mercial and productivity solutions.
Data connections
In order to browse via WAP or use an Internet
connection, the user must have a data communi-
cation connection configured in the phone. Such
a connection is called a Data connection. This
connection contains specific settings and param-
eters for the connection, for example, the address
to the appropriate server. Several Data connec-
tions can be saved in the T200/T202, with differ-
ent settings. To make it easier for the user, Data
connections can be provided by the operator in a
message over the air, OTA provisioning.
Advantages of Data connections include:
• Once the data connections are defined and
named, the user does not have to enter the
settings for the connection again.
• Data connections can be re-used at any time.
• When working with WAP or the Internet, the
user simply selects which Data connection
they want to use for the activity.
• Data connections are used for both GSM
Data and GPRS connection settings.
• Data connections contain choice of bearer
type for WAP and corresponding bearer spe-
cific parameters.
• Data connections contain all settings for the
Internet access point, whether a modem pool

T200/T202
White Paper
13
phone number or an IP address, and the user
ID and password.
Mobile positioning
The geographic location of mobile subscribers
can be used to provide them with related informa-
tion and a variety of services. Sony Ericsson’s
Mobile Positioning System (MPS) is a network-
dependent service, and gives operators a fast and
cost-effective way to establish and roll out loca-
tion-based services.
More information regarding possibilites with and
technologies for mobile positioning is available at
http://www.SonyEricsson.com/mobilepositioning
Note: Available with U.S version only.
.
General Packet
Radio Services
The introduction of GPRS (General Packet Radio
Services) is one of the key steps in the evolution
of today’s GSM networks to enhance the capabil-
ities for data communication. Data traffic is
increasing enormously over both wired and wire-
less networks. This growth in demand for Internet
access and services reflects the explosion in
demand for mobile communications. Users want
access to the Internet while they are away from
their offices and homes.
The main applications driving the wireless Internet
development are web browsing and pull content,
also known as web clipping. User surveys have
found that a vast majority of executives and busi-
ness professionals want wireless Internet access
for web browsing with both text and graphic
capabilities! The demand for high-speed Internet
access will be the key driver for coming genera-
tions of wireless services equal to, or faster than
wired, and GPRS can deliver this mobile Internet
function. GPRS will allow innovative services to
be created, enabling new and previously inacces-
sible market segments to be addressed, increas-
ing customer loyalty and reducing churn.
Machine-to-machine and person-to-machine
communications will become possible.
GPRS applications can be developed both as hor-
izontal and vertical applications. Vertical applica-
tions can, for example, be operations like police
and emergency, taxi, and delivery or automated
services such as vending machines, supervision
and vehicle tracking. Horizontal applications are
generic, such as Internet access, messaging, e-
commerce and entertainment. One of the advan-
tages of GPRS is that it will profit from the global
coverage of exisiting GSM networks. Therefore,
applications developed for GPRS can be
deployed on a large scale, increasing revenues for
network operators and service providers. GPRS
also provides an ideal secure medium for connec-
tions to private networks, banking and financial
services.
The T200/T202 supports GPRS, which means
that the data is sent in packages. The phone

14
T200/T202
White Paper
remains connected to the network all the time
without using any transmission capacity, until
data needs to be sent or received.
Using GPRS in the T200/T202
Instead of occupying a whole voice channel for
the duration of the call, data is sent in small pack-
ets as needed, just like IP on the Internet. Capac-
ity is used only when data is being sent or
received, which means that it is possible to be
“constantly” connected, as required by the appli-
cation in use.
The GPRS specification includes four coding
schemes that allow data speeds of 9,050 bps,
13,400 bps, 15,600 bps and 21,400 bps respec-
tively. The T200/T202 works with the first two
coding schemes, but data speed will naturally
vary according to network configuration.
The GSM system's design limits the ability to use
all eight time slots. Instead, the T200/T202 uses
up to three time slots for receiving data, and one
slot for transmitting.
Information about the identity of the phone and
the characteristics of the connection are
described in the PDP context (Packet Data Proto-
col context). This information is stored both in the
phone and in the mobile network, so that each
phone is identified and “visible” to the system. In
the T200/T202, multiple PDP context settings can
be set via the menu system, or by OTA provision-
ing.
Using GPRS with the T200/T202 has several
advantages, for example:
• Constant connection
Keep an open connection to the company
network, staying online to receive and send
messages at all times. All connection settings
can be managed by using the Data connec-
tions feature.
• Cost efficient
As GPRS is an IP-based connection, this
means that a high transmission capacity is
only used when needed. This makes it possi-
ble to stay connected via GPRS, whereas
keeping a constant circuit switched connec-
tion would be more expensive.
• WAP over GPRS
Access the Internet via WAP and be con-
stantly connected. The user can run WAP
functions such as browsing.
• Data communication
Using GPRS, this provides data and Internet/
Intranet access, for a PC, PDA or handheld
device connected via the RS 232 Cable.
• Data and voice
The T200/T202 can maintain a data connec-
tion when conducting a voice call.
• Provide settings
The GPRS configuration settings can be sent
from the provider over the air, OTA. This way,
the user can use GPRS without making any
settings in the phone.
• User controlled settings
Full user control is enabled in the T200/T202.
In the Data connections menu, the user can
set up multiple descriptions and access
advanced settings for GPRS, for example
Data compression and Quality of Service.

T200/T202
White Paper
15
Modem and AT
commands
The T200/T202 contains a complete GSM
modem. This provides data communication, as
well as Internet/Intranet access, for a connected
PC, PDA or handheld device. Once the PC/PDA is
connected to the phone using a cable, and the
appropriate software is installed, the modem in
the phone works in a similar way to a PC Card
modem, or an external modem.
In the T200/T202, AT commands are used both
for:
• controlling the data communication between
the PC and the remote service
• configuring and requesting settings and
behaviours in the phone, from a connected
PC or PDA
GSM data communication
The built-in data capability turns the phone into a
modem when connected to a PC/PDA. The T200/
T202 offers the user data connection anytime,
anywhere, unmatched by fixed telephone net-
works. Each GSM channel is divided into eight
repeating time slots. A normal GSM voice or data
call is circuit switched, and only one time slot is
used for each call. The data speed is, therefore,
limited to 9,600 bps.
GPRS enables constant
connection
With GPRS, the connection is maintained “con-
stantly”, and data is transmitted in packets. Pric-
ing of GPRS can be dependent on the actual use
of bandwidth, which means very low cost when
no data is sent or received, while the phone
remains connected.
This section outlines the AT commands sup-
ported by the T200/T202. The information here
can be of use for advanced users, to indicate the
possibilities they have to:
• develop new communications software
• add the T200/T202 to an application’s list of
compatible modems
• adjust the settings of their mobile telephone
and modem
The modem in the T200/T202 supports the V.25ter
command set, which is the standard communica-
tion set used by modems.
The T200/T202 is compatible with industry de
facto extensions, ETSI 07.05, 07.07 and 07.10.
Overview of AT command functions
You use AT commands to configure your mobile
telephone, to request information about the cur-
rent configuration or operational status of your
mobile phone, and to test availability and request
the range of valid parameters, when applicable,
for an AT command.
The built-in modem can be set to any one of three
modes of operation. These are:
Off-line command mode
The built-in modem is placed in off-line command
mode when first started and is ready for entry of
AT commands.
On-line data mode
Allows “normal” operation of the built-in modem,
exchanging data or facsimile with the remote
modem.
On-line command mode
You can switch to on-line command mode when
you want to send AT commands to the built-in
modem while still remaining connected to the
remote modem.
The AT commands in the T200/T202 are grouped
as follows:

16
T200/T202
White Paper
• Control and Identification
•CallControl
• Interface Commands
• Data Compression
• Mode Management
• Audio Control
• Accessory Menus
• Accessory Authentication
• Voice Call Control
• Accessory Identification
• GSM DTE-DCE Interface Commands
• GSM Call Control
•GSMData
• GSM High Speed Circuit Switched Data
• GSM Network Services
• GSM USSD
•GSMFacilityLock
• GSM Mobile Equipment, Control and Status
• GSM Mobile Equipment Error Control
• GSM SMS and PDU Mode
•GSMGPRS
• GSM Phonebook
• GSM Clock, Date and Alarm Handling
• GSM Subscriber Identification
• Sony Ericsson Specific AT Commands for
GSM
In-phone functions
and features
*Subscription and/or network-dependent
In-phone functions and features
A Alarm clock with snooze function Yes
B Background light Yes, blue
Background pictures Yes, 6 which can be edited by the user +
1 customised
Bookmarks (URL memory) Yes, 24 user-defined and 1 for customiza-
tion
C Calculator Yes
Calendar Yes, (month and week view)
Call barring* Yes
Call divert* Yes
Call hold* Yes
Call screening* Yes
Call list (last dialled, answered and missed calls) Yes, 30 entries
Call time/call cost (a.k.a Advice of Charge, Infor-
mation/Charging)*
Ye s
Call transfer* Yes
Calling card service Yes

T200/T202
White Paper
17
Calling Line Identification (CLI) Yes, with name or number, personal ring
signal and pictures
Clock Yes
Closed User Groups (CUG)* Yes, 9
Conference calls* Yes
CSD, Circuit Switched Data* Yes
D Data accounts 10 (which can be customised)
Date Yes
EMS (Enhanced Messaging Service)* Yes
EMS, own pictures/icons Yes, 10
EMS, pre-defined pictures/icons 35
EMS, animations Yes
External antenna connector Yes
F Fixed Dialling Numbers (FDN)* Yes
GGames Yes,5games
GPRS (General Packet Radio Services)* Yes
H High Speed Data (HSCSD) Yes
Input methods T9™ Text Input, multitap alphabetic (GSM
standard), Bopomofo, Pinyin and Stroke
Internet button Yes
Keypad lock Yes
L Languages 43
M Memory check Yes
Mobile chat Yes
Modem Yes, built-in
OOptionkey Yes
P Phone book Up to 250 contacts in phone + SIM
Phone book groups 10
Phone lock Yes
Picture phone book Yes
Profiles Yes, 7
R Re-dialling, automatic Yes
Ring signals, pre-programmed Yes
In-phone functions and features

18
T200/T202
White Paper
Network-dependent features
SMS and EMS messaging
The T200/T202 is capable of sending and receiv-
ing SMS, EMS messages and linked messages.
• With the Short Message Service, a user can
send text messages containing up to 160
characters to and from GSM mobile stations
• With the linked SMS, the user can link several
SMS messages together to create a longer
message (network-dependent service)
A Service Centre (SC) acts as a a storage and for-
warding centre. The T200/T202 also supports
using SMS as a bearer type for connecting to
WAP.
SMS consists of two basic services:
• Mobile Originated SMS (from a mobile station
to an SMS-C)
• Mobile Terminated SMS (from an SMS-C to a
mobile station)
For Mobile Originated SMS, an SMS message is
sent from a Mobile Station to the SMS-C where it
is forwarded to its destination. This can be
Ring signals, own/customized 8
Ring signals, exchange Yes, via EMS
Shortcuts Yes
SIM Application Toolkit* Yes
SIM card lock Yes
Sleeping display Yes
SMS (Short Message Service)* Yes
SMS, long messages (a.k.a. concatenated
SMS)*
Yes, up to 6 messages of 160 characters
each
SMS Cell Broadcast* Yes
SMS counter Yes
SMS templates Yes, 10 templates of 30 characters each
Speech coding Enhanced, Full and Half Rate
Speed dialling Yes
Start-up/Shutdown shows Yes, 3 (1 standard, 1 own, 1 customised)
Status menu Yes
Stopwatch Yes
TTimer Yes
Two Line Service* (a.k.a Alternate Line Service,
ALS)
Ye s
V Vibrating alert Yes
W WAP browser Yes, WAP 1.2.1 browser
WAP certificates VeriSign, GlobalSign, Baltimore, Entrust
WTLS for added WAP security* Yes, WTLS class 3
In-phone functions and features

T200/T202
White Paper
19
another Mobile Station, or a terminal in the fixed
network.
A Mobile Terminated SMS is when an SMS mes-
sage is forwarded from the SMS-C to a Mobile
Station. When the Mobile Station receives the
message, it returns a delivery report saying the
transfer was successful.
Fixed dialling and Restricted calls
For a company or an organization, it can be useful
to restrict phone calls. Fixed Dialling allows you to
preset a number of digits, for example area
codes. This restricts the user to making calls only
to numbers which use the preset digits as leading
digits. Fixed Dialling makes use of the PIN2, and it
requires fixed dial fields on the SIM card. Check
with your operator about this feature.
The Restrict Calls service allows you to block out-
going or incoming calls in certain situations, for
example international calls.
SIM application
toolkit
The SIM Application Toolkit (SIM AT) is a smart
card-centric method of deploying programs that
apply only to GSM and to SMS and USSD trans-
ports. Programs must be distributed on smart
cards. WAP is an Internet-centric method of
deploying programs that is independent of net-
work technology. Programs and content are kept
centrally on web servers and downloaded as
required. While there is some overlap, WAP is a
particularly good choice when deploying pro-
grams that also have an HTML version for desk-
top use. Work is currently underway on building
interfaces between the two technologies.
For an operator, a company or service provider,
SIM AT offers a powerful way to deploy programs
and services to users, without the need for new or
upgraded equipment. All necessary setup and
programming is distributed to users over the air,
directly to their phones. In the T200/T202, a sepa-
rate menu is available for functions residing on the
SIM card. These can include submenus for con-
trolling functions, and also functions which allow
the phone to initiate calls, send data, and display
information to the user.
SIM AT services supported by the T200/T202
Service Mode Support
in T200/
T202
CELL BROADCAST DOWN-
LOAD
Ye s

20
T200/T202
White Paper
DISPLAY TEXT General: Support for packed and unpacked for-
mat in SMS default alphabet as well as UCS2
alphabet
Ye s
bit 1: 0 = normal priority Yes
1 = high priority Yes
bit 8: 0 = clear message after a delay Yes
1 = wait for user to clear message Yes
GET INKEY General: The GET_INKEY requires that the user
press "Yes" to confirm his/her choice
Ye s
bit 1: 0 = digits (0-9, *, # and +) only
1 = alphabet set
Ye s
Ye s
bit 2: 0 = SMS default alphabet
1 = UCS2 alphabet
Ye s
Ye s
bit 3: 0 = character sets defined by bit 1 and bit 2 are
enabled
1 = character sets defined by bit 1 and bit 2 are
disabled and the "Yes/No" response is
requested
No
No
GET INPUT General: No. of hidden input characters 20
bit 1: 0 = digits (0-9, *, # and +) only
1 = alphabet set
Ye s
Ye s
bit 2: 0 = SMS default alphabet
1 = UCS2 alphabet
Ye s
Ye s
bit 3: 0 = ME may echo user input on the display
1 = user input not to be revealed in any way
Ye s
Ye s
bit 4: 0 = user input to be in unpacked format
1 = user input to be in SMS packed format
Ye s
Ye s
bit 8: 0 = no help information available
1 = help information available
Ye s
No
MORE TIME Ye s
PLAY TONE Ye s
POLLING OFF Ye s
POLL INTERVAL Ye s
Service Mode Support
in T200/
T202

T200/T202
White Paper
21
PROVIDE LOCAL INFORMA-
TION
'00' = Location Information (MCC, MNC, LAC
and Cell Identity)
Ye s
'01' = IMEI of the ME Yes
'02' = Network Measurement results No
'03' = Date, time and time zone (DTTinPLI) No
REFRESH General: The reset option requests the user to
wait while the phone restarts
Ye s
'00' =SIM Initialization and Full File Change
Notification
Ye s
'01' = File Change Notification Yes
'02' = SIM Initialization and File Change Notifi-
cation
Ye s
'03' = SIM Initialization Yes
'04' = SIM Reset Yes
SELECT ITEM Ye s
SEND SHORT MESSAGE bit 1: 0 = packing not required
1 = SMS packing by the ME required
Ye s
Ye s
SEND SS Ye s
SEND USSD Ye s
SET UP CALL General: Capability configuration
Set-up speech call CallParty
Subaddress DTMF support
Ye s
No
Ye s
'00' = set up call, but only if not currently busy
on another call
Ye s
'01' = set up call, but only if not currently busy
on another call, with redial
Ye s
'02' = set up call, putting all other calls (if any)
on hold
Ye s
'03' = set up call, putting all other calls (if any)
on hold, with redial
Ye s
'04' = set up call, disconnecting all other calls (if
any)
Ye s
'05' = set up call, disconnecting all other calls (if
any), with redial
Ye s
SET UP MENU Ye s
Service Mode Support
in T200/
T202