My iPhone 4 won't send text messages! My iPhone is not sending text messages through. It will take a long time to send (progressing the little bar at top very slowly), then it says "Message not Delivered". Why and how can I resolve this?
I had the same problem, there are two things you can try:


It is possible that your carrier's network is having problems. The best course of action is to see whether the problem goes away after a day or two
Have the person you are trying to message send you a message to your phone and reply then to see whether this fixes the connection issues