I've been trying a few fixes with not much luck but I had an idea worth sharing... First thing was calling VM, which unless you want to waste an hour and put yourself in a bad mood the rest of the day with the same problem, is not the answer.
I remember when I switched to the EVO from the Triumph my voicemail greeting changed to a sprint voicemail box, so last night I switched back to the Triumph and this morning I had voicemail (the virgin mobile one)! Ok great, now I can wait a day and switch back to the EVO and that might fix the problem... Nope, now my triumph has the busy signal again on voicemail.
So, I had a glimpse of a fix. I'll have to wait until tmrw morning to see if the see if switching back works...if not then another call to VM and try to get this escalated.