OK. My wife and I have iPhones. I did the carrier 5.0 file update on both. I was doing the whole switch sim trick and we were both getting and sending images. Mine has stopped working and hers is STILL going. I have even since jailbroke both phones and hers is still going. Here is what I found. When I would access myATT site. The image that it shows you have as your phone is what stops MMS from working. My image is an iPhone and hers is some Samsung phone. Once mine changed back, I stopped receiving. Hers has never changed back, so she's been good. This may be known to some of you, but it's what I discovered to be why for us, so no flaming.