Just a few things to note:
It does not matter where the phone came from. Cricket does not care if the ESN is from verizon or whom ever. If you can make calls, then you are connected to the network. END OF STORY.
Second, when everyone is saying that MMS and WAP are working just fine with the monster flash, they are probably talking about the cricket monster flash. Yes, you can use a foreign phone and the Cricket Monster flash on your v3m and EVERYTHING will work, except for your transflash card. MMS and WAP will work once you get the configuration in PST correct which you can find on the main cricket forum.
The original poster reported having problems with the Alltel firmware on the V3M and not getting WAP and MMS. I have loaded my V3M with the NCR_01.1A.00R firmware and now my phone will not access MMS or WAP. I have spent several hours digging through seems and PST configs trying to find the problem with no success. Forget about the possibility of a "foreign ESN" causing these issues because you can load the cricket monster file and get online just fine. I will continue to mess around with the alltel firmware and try and get MMS and WAP. If anyone has any details on a Verizon V3M running NCR_01.1A.00R on the Cricket network that is able to access WAP and MMS, please post details.
Have a great day
Tommy