
Sony Xperia M2 Aqua
Find "Voicemail number"
Slide two fingers down the display starting from the top edge of your phone.
Press Shortcut to Settings.
Press Shortcut to Settings.
Press Call settings.
Press Voicemail.
Press Setup.
Press Voicemail number.
Save voicemail number
Key in +447836121121 and press OK.
Return to the home screen
Press the home icon to return to the home screen.