iOS 6 breaks MMS
I am on a 16GB iPhone 4 on AT&T. After upgrading to iOS 6 today MMS functions are completely broken. I cannot send a picture or video message to anyone. It just gives me the red exclamation point and says "Not delivered". I have already reset my network settings. I have removed any custom APN settings, I've even tried a hard reset (holding down Home and Power simultaneiously till the phone shuts down and restarts). Nothing has worked and I am still without MMS.
Any help on troubleshooting this would be greatly appreciated. I can't be the only one who has this problem. Anyone?
iPhone 4, iOS 6