Sony Xperia 10
It's not possible to receive voice calls
Solution 3 of 3: Barring of incoming calls is turned on
You can block certain types of calls such as incoming calls when you're abroad.
Press the phone icon.
Press the menu icon.
Press Settings.
Press Calls.
Press Call barring.
Press the required barring type.
Key in your barring password and press TURN ON.
Press the Home key to return to the home screen.