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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 in your phone making it easy to call. Follow these instructions to save the voicemail number.
Find "Voicemail number"
Press Call settings.
Press Voicemail number.
Enter voicemail number
Key in (prefix) 5 (your phone number) and press OK.
Press the Home key to return to standby mode.