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Wi-Fi technology troubleshooting............................................................................................................................................................................................................ 258
Power, battery, and memory..................................................................................................................................................................................................................... 259
Turn off your device................................................................................................................................................................................................................................... 259
Set your device to turn on and turn off automatically........................................................................................................................................................................... 259
Reset the device......................................................................................................................................................................................................................................... 259
Check the battery power level.................................................................................................................................................................................................................. 259
Extend battery life...................................................................................................................................................................................................................................... 259
Format the device memory or a media card........................................................................................................................................................................................... 260
View the amount of available memory.................................................................................................................................................................................................... 260
Best practice: Conserving memory on your device................................................................................................................................................................................ 260
The application memory on my device is low......................................................................................................................................................................................... 261
SIM card...................................................................................................................................................................................................................................................... 262
About the SIM card phone book............................................................................................................................................................................................................... 262
Add a contact to your SIM card................................................................................................................................................................................................................ 262
Copy contacts from your SIM card to your contact list......................................................................................................................................................................... 262
Copy a contact from your contact list to your SIM card........................................................................................................................................................................ 262
Change a SIM card contact...................................................................................................................................................................................................................... 263
Delete a SIM card contact........................................................................................................................................................................................................................ 263
Store SMS text messages on your SIM card........................................................................................................................................................................................... 263
About SIM card security............................................................................................................................................................................................................................ 264
Protect your SIM card with a PIN code................................................................................................................................................................................................... 264
Change the SIM card PIN code................................................................................................................................................................................................................ 264
Change the display name for a phone number...................................................................................................................................................................................... 264
Security........................................................................................................................................................................................................................................................ 265
Security basics............................................................................................................................................................................................................................................ 265
Password keeper........................................................................................................................................................................................................................................ 267
Encryption................................................................................................................................................................................................................................................... 269
Memory cleaning........................................................................................................................................................................................................................................ 272
Certificates.................................................................................................................................................................................................................................................. 273
PGP keys..................................................................................................................................................................................................................................................... 281
Certificate servers...................................................................................................................................................................................................................................... 287
Key stores.................................................................................................................................................................................................................................................... 289
Smart cards................................................................................................................................................................................................................................................. 292
Software tokens.......................................................................................................................................................................................................................................... 296
VPN settings............................................................................................................................................................................................................................................... 297
About security self-tests............................................................................................................................................................................................................................ 298
Verify security software............................................................................................................................................................................................................................. 298
Third-party application control................................................................................................................................................................................................................ 298
Security troubleshooting........................................................................................................................................................................................................................... 302