Can you still receive texts but not mms? Or both?
I am not familiar with phones flashed to another carrier, but I am familiar with the Evo4g.
Can you update prl and profile? Do you use the stock app for mms? Have you tried something like GoSmsPro and see if it happens with that app?
I don't think we even have a guide for flashing an Evo4g to ST.
I know we have a guide for boost and MetroPCS, but not ST.
Let us know if you need more help
Thanks for joining