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Press *86 and then send from your Verizon Wireless device. Press the # key to proceed, if you hear a greeting message. Follow the instructions to create a password, a personalized greeting message, or to change your voice mailbox options.
If you care to activate your voice mail without your personal Verizon Wireless phone, just dial your wireless phone number and your voice mail will answer.  The voice mail features are: 20 messages, 3 minute length per message, and a 21 day hold period on all voice mails.