Specifications

Basic Operations
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In standby mode, press and hold to lock the keypad. The indicator
will be displayed. To unlock the keypad, press and hold again in
standby mode.
When the keypad is locked, you can answer a call as usual. During the
call, you can operate the phone normally. However, the keypad will
automatically lock when the call ends, or if the call is rejected.
When the keypad is locked, even if the backlight is not set to Off, the
LCD screen and keypad will not light when keys are pressed.