I just got an iPhone 4 yesterday and sent one picture right when I got it (I might add that it send perfectly fine in my basement) and as of last night and today, the sending bar makes it to about 90% and just stops. And then the delivery fails. I have 3 bars and have tried sending outside as well. I checked my wireless plan and have confirmed that I DO have unlimited MMS. Yes, my MMS setting is turned on. I have tried turning it off, then on again. I have also turned the phone off and back on and tried resetting it. It is sending texts fine but it is really annoying me about the pictures. My old phone sent pictures FINE from my house. I might add that I have Verizon. Any clues?