Recently, I have been made aware of the fact that my iPhone 4S has been not receiving texts from certain numbers (my best friend and boyfriend's numbers to be exact). Needless to say, this is frustrating, and stressful for both relationships. So far, it's just been both those numbers, but I want to fix this problem before it spreads to other numbers. I have tried turning the phone off, and removing the SIM card, but it still happened afterwards. My phone is always kept at a reasonable charging level, and everything else is ok. Has anyone else had this problem? If so, what did you do to fix it?