Nokia 3555 - Manual (Page 28)

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Warning: With the flight profile you cannot make or receive any calls, including
emergency calls, or use other features that require network coverage. To make
calls, you must first activate the phone function by changing profiles. If the
device has been locked, enter the lock code. If you need to make an emergency
call while the device is locked and in the flight profile, you may be also able to
enter an official emergency number programmed in your device in the lock
code field and select ‘Call’. The device will confirm that you are about to exit
flight profile to start an emergency call.
To deactivate the flight mode, select any other profile.
Note: In the flight profile, you may need to unlock the device and change to
the calling profile before making a call.
■ Keypad lock (keyguard)
Select Menu or Unlock (1), and press * (2) within
1.5 seconds to lock or unlock the keypad.
If the security keyguard is activated, enter the
security code if requested.
To answer a call when the keyguard is on, press
the call key or open the phone. When you end or
reject the call, the keypad automatically locks.
For Security keyguard, see "Phone," p. 64.
When the keyguard is on, calls may be possible to the
official emergency number programmed into your phone.