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Your price plan includes voicemail where callers can leave a voice message when you don't answer a call. You can save the voicemail number on your phone making it easy to call. Follow these instructions to save the voicemail number.
Find "Voicemail number"
Press Voicemail number.
Enter voicemail number
Key in +447836121121 and press OK.
Press the Home key to return to standby mode.