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Your price plan includes voicemail where callers can leave a voice message when you do not answer a call. The voicemail number can be saved in the device 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 OK to confirm.
Press the Home key to return to standby mode.