Help & support guides for your HTC One M9
You can block certain types of calls such as incoming calls when you're abroad.
Slide your finger down the display starting from the top edge of your phone.
Press the settings icon.
Press Call.
Press Call barring settings.
Press one of the following options:
All outgoing
Outgoing international
Outgoing international roaming
All incoming
Incoming calls when roaming
Key in your barring password and press OK to turn the function on or off.
Press the home icon to return to the home screen.
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