bills are paid, everything is good. I have been using it texting and calling for over 2 months without a problem until I can no longer send and receive text messages because of this "emergency calls only" line on the screen an hour ago. It was totally out of the blue.
I restarted and turned back on the phone for over 10 times and it is still doing the same thing.
Also, the sim card and the battery seem fine.

Suggestion please? thank you!