[xweaponx]

If your current service is through Sprint, then you still have Sprint even with the custom rom/radio. The flashing for carrier service is different than flashing rom/radios. You can install that exact same radio/rom combo on a Verzion, Sprint, Alltel, etc device but ultimately all will still have their relative carrier voice/data service regardless of rom/radio. In order to recieve Cricket service, you need flashing of another route.

There may be some reading material available on possibilities of doing this yourself but it may be involved...