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Fixed dialling allows you to select which numbers your phone can call. When fixed dialling is turned on, you can only make calls to your fixed numbers and to emergency numbers. Incoming calls aren't affected. Follow these instructions to turn fixed dialling on or off.
Find "Fixed Dialling Numbers"
Press All apps to access the main menu.
Press Fixed Dialling Numbers.
Turn fixed dialling on or off
Press Enable FDN or Disable FDN (depending on the current setting).
Key in your PIN2 and press OK.
Press the Home key to return to standby mode.