Who I have the same questioned this topic

When I try to access my voicemail I get a busy signal.  When I call my number from another phone and it should go to voicemail, it just says I'm unavailable.  I have an HTC Incredible and my husband, who is having the same problem, has a Motorola.  I've tried dialing *73 and then *228 to reprogram the phone and it still doesn't work.  Please help!