I have a prepaid Samsung Galaxy S3.
I had this problem for a few months now.
I don't receive all the sms that my friends are sending me, but they get all of mine.
Plus, sometimes, when they send a longer sms, their sms will get all mixed up : the first part of what they wrote is OK, but the second part looks like part from old sms they sent me months ago.
My friends don't have this issue when they send sms to others of our friends.
What can I do?