So I finally decided to upgrade to the iphone5, so i went to AT&T and got set up.... MMS works fine with the iphone5, but I want to still use my jailbroken iphone4 (4.2.1) with the new SIM & adapter. Voice/Data/SMS works fine while on the iphone4, but when i try to send/receive a picture or contact information... it fails... 
anyone have any idea for me?
anyone have any idea for me?