Nokia 2690 - Manual (Page 16)

Keypad lock
To prevent accidental keypresses, select Menu , and press
* within 3.5 seconds to lock the keypad.
To unlock the keypad, select Unlock , and press * within 1.5
seconds. If the security keyguard is on, enter the security
code when requested.
To set the keypad to lock automatically after a preset time
when the phone is in the standby mode, select Menu >
Settings > Phone > Automatic keyguard > On .
To answer a call when the keypad is locked, press the call
key. When you end or reject the call, the keypad locks
automatically.
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