Device Guides
Microsoft Lumia 640
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Turning fixed dialing on my mobile phone on or off
If you want to select the numbers your mobile phone can call, you need to turn on fixed dialing. Once done, you can only call the selected numbers and emergency numbers. Follow these easy instructions.
List view
1. Find "settings"
Tap the phone icon.
Tap the dots in the bottom right corner of the display.
Tap settings.
2. Turn fixed dialing on or off
Tap the indicator next to "Fixed Dialling (FDN)" to turn the function on or off.
Key in your PIN2 (default is 0000) and tap enter.
3. Return to the home screen
Tap the home icon to return to the home screen.
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