iPhone 4s won't send or receive texts, iMessage won't activate.
I recently moved away from home for school and where I moved to I'm roaming constantly. My phone started not receiving or sending texts to people without iMessage. I turned my iMessage off to try to send myself a text and make the others come through and now my iMessage won't activate. I can only receive phone calls now. I've tried everything to fix it. Turned my phone off and on, reset all my settings. Nothing works.
iPhone 4S, iOS 7.1.2, Appalachian Wireless