Turn off the connection to the wireless network.................................................................................................................................................................................... 228
Turn on or turn off data service or set roaming options........................................................................................................................................................................ 228
Wireless networks that your device connects to.................................................................................................................................................................................... 229
Change the connection speed for the wireless network....................................................................................................................................................................... 229
Turn on LED notification for wireless coverage...................................................................................................................................................................................... 229
Check the status of network connections and services......................................................................................................................................................................... 230
Roaming...................................................................................................................................................................................................................................................... 230
Preferred wireless network list................................................................................................................................................................................................................. 232
Troubleshooting.......................................................................................................................................................................................................................................... 233
Power, battery, and memory..................................................................................................................................................................................................................... 235
Turn off your device................................................................................................................................................................................................................................... 235
Set your device to turn on and turn off automatically........................................................................................................................................................................... 235
Reset the device......................................................................................................................................................................................................................................... 235
Check the battery power level.................................................................................................................................................................................................................. 235
Extend battery life...................................................................................................................................................................................................................................... 235
Format the device memory or a media card........................................................................................................................................................................................... 236
View the amount of available memory.................................................................................................................................................................................................... 236
Best practice: Conserving memory on your device................................................................................................................................................................................ 236
The application memory on my device is low......................................................................................................................................................................................... 237
SIM card...................................................................................................................................................................................................................................................... 238
About the SIM card phone book............................................................................................................................................................................................................... 238
Add a contact to your SIM card................................................................................................................................................................................................................ 238
Copy contacts from your SIM card to your contact list......................................................................................................................................................................... 238
Copy a contact from your contact list to your SIM card........................................................................................................................................................................ 238
Change a SIM card contact...................................................................................................................................................................................................................... 239
Delete a SIM card contact........................................................................................................................................................................................................................ 239
Store SMS text messages on your SIM card........................................................................................................................................................................................... 239
About SIM card security............................................................................................................................................................................................................................ 240
Protect your SIM card with a PIN code................................................................................................................................................................................................... 240
Change the SIM card PIN code................................................................................................................................................................................................................ 240
Change the display name for a phone number...................................................................................................................................................................................... 240
Security........................................................................................................................................................................................................................................................ 241
Security basics............................................................................................................................................................................................................................................ 241
Password keeper........................................................................................................................................................................................................................................ 243
Encryption................................................................................................................................................................................................................................................... 245
Memory cleaning........................................................................................................................................................................................................................................ 248
Certificates.................................................................................................................................................................................................................................................. 249
PGP keys..................................................................................................................................................................................................................................................... 257
Certificate servers...................................................................................................................................................................................................................................... 263