I had a problem with my 6800 mms not working when I first got it. I have since switched to VV's Cricket rom and now it works almost perfectly (sometimes I have to soft reset and it will start working again).
But every other phone I've flashed w/ wap and picture messaging is still working fine. Sometimes though the 10digit#@mycricket.com changes to 10digit#@vzw.com and i have to change it back but other than that everything works for me.
I'm in the nashville area.
I've never been able to get a V3m to work w/ mms using the alltel flash so i've always had to flash it to the v3c.
Cricket has this new thing when activating a phone that if it's not a regular cricket phone you put the model of the phone in (say it's a chocolate you put vx8500) maybe they started incorporating this so they COULD start blocking picture messaging on flashed hanRABets...
just my 2 cents