Keypad Lock 
In standby mode, press the Centre Key
followed by 
to lock/unlock your keypad (including the Jog Dial). It is still possible to make emergency calls (112) as well as answer/reject an incoming call (by pressing
/ 
) when the keypad is locked. After the call ends, the keypad will lock again automatically.
10GB
Icon Glossary
Icon Explanation
Network not available
Network signal strength (strong)
Battery strength
SMS (Envelope Icon)
Voicemail
Keypad locked
Alarm
Silent Mode
Vibra Alert
Single Beep
Ringer off
Missed calls
Incoming call barring
Outgoing call barring