Non iPhone plan.
Yes, I have MMS on a non iPhone data and txt plan. I'm was using my iPhone 3G on a 450 Min. phone plan with 200 bonus Min. for $31 and unlimited txt for $20 and Media net unlimited internet for $15. But recently had remove the data plan.
I recently received a txt from ATT asking me to call them (yeah righ) before sep 14 to add the necessary ($30) data plan required for the iPhone. Well on the 15th my data stopped working, so I removed the data package from my bill. As of the 15th every time I try to use safari, email, or anything that uses the internet without wifi I get a message "Could not activate cellular data network you are not subscribed to a cellular data service". I suppose ATT has blocked my iPhone from using their data network (oh well no obscene charges for data). At least the wifi still works. I suppose I'll need to put the sim back on my old phone and call them to get my data turned back on...