Samsung Galaxy A13
Android 12.0
1. Find "Voicemail number"
Press the phone icon.
Press the menu icon.
Press Settings.
Press Voicemail.
Press Voicemail number.
2. Save voicemail number
Key in +447836121121 and press OK.
+447836121121
3. Return to the home screen
Press the Home key to return to the home screen.