Turning on "Barring All Incoming Calls" is a nuclear option for focus. Unlike "Do Not Disturb" modes on smartphones—which usually allow a second call from the same number to come through or let "Favorites" ring—call barring blocks the network connection entirely. The caller will simply hear a message that you cannot be reached.

For security, you should change the default password provided by your carrier. You can do this by dialing: ** 03 330 [Old Code] * [New Code] * [New Code] # Limitations and Considerations

While powerful, call barring codes come with a few caveats:

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