Turn off the connection to the wireless network.................................................................................................................................................................................... 227
Turn on or turn off data service or set roaming options........................................................................................................................................................................ 227
Wireless networks that your device connects to.................................................................................................................................................................................... 228
Change the connection speed for the wireless network....................................................................................................................................................................... 228
Turn on LED notification for wireless coverage...................................................................................................................................................................................... 228
Verify the status of network connections and services......................................................................................................................................................................... 229
Roaming...................................................................................................................................................................................................................................................... 229
Preferred wireless network list................................................................................................................................................................................................................. 231
Troubleshooting.......................................................................................................................................................................................................................................... 232
Power, battery and memory...................................................................................................................................................................................................................... 234
Turn off your device................................................................................................................................................................................................................................... 234
Set your device to turn on and turn off automatically........................................................................................................................................................................... 234
Reset the device......................................................................................................................................................................................................................................... 234
Check the battery power level.................................................................................................................................................................................................................. 234
Extend battery life...................................................................................................................................................................................................................................... 234
Format the device memory or a media card........................................................................................................................................................................................... 235
View the amount of available memory.................................................................................................................................................................................................... 235
Best practice: Conserving memory on your device................................................................................................................................................................................ 235
The application memory on my device is low......................................................................................................................................................................................... 236
SIM card...................................................................................................................................................................................................................................................... 237
About the SIM card phone book............................................................................................................................................................................................................... 237
Add a contact to your SIM card................................................................................................................................................................................................................ 237
Copy contacts from your SIM card to your contact list......................................................................................................................................................................... 237
Copy a contact from your contact list to your SIM card........................................................................................................................................................................ 237
Change a SIM card contact...................................................................................................................................................................................................................... 238
Delete a SIM card contact........................................................................................................................................................................................................................ 238
Store SMS text messages on your SIM card........................................................................................................................................................................................... 238
About SIM card security............................................................................................................................................................................................................................ 239
Protect your SIM card with a PIN code................................................................................................................................................................................................... 239
Change the SIM card PIN code................................................................................................................................................................................................................ 239
Change the display name for a phone number...................................................................................................................................................................................... 239
Security........................................................................................................................................................................................................................................................ 240
Security basics............................................................................................................................................................................................................................................ 240
Password keeper........................................................................................................................................................................................................................................ 242
Encryption................................................................................................................................................................................................................................................... 244
Memory cleaning........................................................................................................................................................................................................................................ 247
Certificates.................................................................................................................................................................................................................................................. 248
PGP keys..................................................................................................................................................................................................................................................... 256
Certificate servers...................................................................................................................................................................................................................................... 262