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You can save your voicemail number making it easy to call and listen to your voice messages.
1. Find "Setup"
Press the phone icon.
Press the menu icon.
Press the required SIM.
Press Advanced Settings.
2. Save voicemail number
Press the field below "Voicemail number".
Key in +447836121121 and press OK.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.