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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.

Article:
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.