
Sony Xperia E4
Find "Voicemail number"
Slide two fingers down the display starting from the top edge of your phone.
Press Settings.
Press Settings.
Press Call.
Press Voicemail.
Press Voicemail settings.
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.