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When fixed dialling is turned on, you can only call selected numbers and do emergency calls. Incoming calls aren't affected.
Find "Fixed dialling numbers"
Slide two fingers down the display starting from the top edge of your phone.
Press Fixed dialling numbers.
Turn fixed dialling on or off
Press Activate fixed dialling or Deactivate fixed dialling (depending on the current setting).
Key in your PIN2 (default is 1111) and press OK.
Return to the home screen
Press the home icon to return to the home screen.