Wi-Fi technology troubleshooting............................................................................................................................................................................................................
Power, battery, and memory.....................................................................................................................................................................................................................
Turn off your device...................................................................................................................................................................................................................................
Reset the device.........................................................................................................................................................................................................................................
Check the battery power level..................................................................................................................................................................................................................
Extend battery life......................................................................................................................................................................................................................................
Format the device memory or a media card...........................................................................................................................................................................................
View the amount of available memory....................................................................................................................................................................................................
The application memory on my device is low.........................................................................................................................................................................................
SIM card......................................................................................................................................................................................................................................................
About the SIM card phone book...............................................................................................................................................................................................................
Add a contact to your SIM card................................................................................................................................................................................................................
Change a SIM card contact......................................................................................................................................................................................................................
Delete a SIM card contact........................................................................................................................................................................................................................
Store SMS text messages on your SIM card...........................................................................................................................................................................................
About SIM card security............................................................................................................................................................................................................................
Protect your SIM card with a PIN code...................................................................................................................................................................................................
Change the SIM card PIN code................................................................................................................................................................................................................
Change the display name for a phone number......................................................................................................................................................................................
Security........................................................................................................................................................................................................................................................
Security basics............................................................................................................................................................................................................................................
Password keeper........................................................................................................................................................................................................................................
Encryption...................................................................................................................................................................................................................................................
Memory cleaning........................................................................................................................................................................................................................................
Certificates..................................................................................................................................................................................................................................................
PGP keys.....................................................................................................................................................................................................................................................
Certificate servers......................................................................................................................................................................................................................................
Key stores....................................................................................................................................................................................................................................................
Smart cards.................................................................................................................................................................................................................................................
Software tokens..........................................................................................................................................................................................................................................
VPN settings...............................................................................................................................................................................................................................................
About security self-tests............................................................................................................................................................................................................................
Verify security software.............................................................................................................................................................................................................................
Third-party application control................................................................................................................................................................................................................
Security troubleshooting...........................................................................................................................................................................................................................
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