So I JB with GP ios4.2.1 AT&T and i can recieve MMS but cant send MMS. On my phone it says it sent successfully but receiver never gets it. I searched and came accross this thread:http://modmyi.com/forums/jailbreaking-verizon-iphone/749776-mms-not-working-after-verizon-iphone-4-jailbreak.html will the com.apple.mms_override.plist file be the same for AT&T? If not, can anybody provide me with their file on AT&T? Any other ideas why this may be happening? Thanks for any help!