I had my Verizon iPhone 4 flashed over to Cricket, and now I can't send MMS. I can receive them with no problems, but when I try to send one it say's it's "Not Delivered". It'd driving me crazy!
I'm not seeing Cricket carrier's APN settings. Jailbreak your iPhone 4 and download the iOS 6 MMS Fixer from Cydia. Unless you know what other wireless company's signals that Cricket is piggybacking, your only way to solve the MMS problem is through Cydia
Never mind. Forgot that Cricket is a literal flash. You'd have to either use the jailbreaking method to get that solved or you're going to have to restore to a clean iOS and re-flash it since the "bypass" is incorporated in the instructions when you flash