4218kris is correct. Your SPC has to be all zero's for the OTA to work.

How to change that is by using QPST.
*please do not ask or PM me where to get it or for a link. Google is your friend

If you are looking for a cricket ready ROM there are plenty of them on here. Unfortunetly only a few will have a program on it called Arcsoft that is needed to have MMS working.

Head over to Howardforums.com and check out the Cricket forum. Plenty of info and help specifically towards cricket customers. My username on there is "FabricatedHero"...feel free to PM if you need any help getting your phone cricket capable.