If you are getting the busy signal when dialing your own ten digit number, then it almost certainly means you have accidentally activated the "No Answer/Busy Transfer" feature on your line. The previous post is exactly right about how to fix this. Here's how the voicemail works and how your problem developed:
Any line activated on Verizon Wireless that does have a voicemail feature on it has an automatic forwarding feature on it that sends the call to the voicemail box if either A) you don't answer your phone for 4-6 rings or B) the network cannot detect your phone or cannot get a call through to it for any reason. This is the way voicemail should work.
However, if the No Answer/Busy Transfer feature is activated on your line it determines when your line is busy and forwards the call to another number. If it was activated on your handset by accidentally dialing *71 5638 SND, then when the network determines that your phone is busy, it will forward your calls to 5638 which is not a legitimate number and will result in a fast busy or error tone.
So what happens when you dial your voicemail? Whether you are dialing *86, holding down the 1 button speed-dial or dialing your own number, they are all calling your 10 digit number. And when you initiate a call from your own phone to your own phone number, as the network tries to connect the call it determines that your phone (which has just started an outbound call) is busy, so the No Answer/Busy Transfer feature overrides the default forwarding to your voicemail box and sends your call to the random number that was activated with the accidental dialing of *71.
So dialing *73 should clear it up!
