Starting from this morning, I could not send any texts messages, it stops around 80% and cannot send it anymore. And, I still also could not receive the SMS and could not call anybody. But, I can still get the phone call. Somebody Please help. I just bought that phone last 3 weeks ago. This is the iphone 4s 16 GB with IOS 5.1.
I tried resetting all those settings and still do not work.