I have had my galaxy s4 for almost a month now. Yesterday I started getting and error code while on wifi calling the code is REG90 Unable to connect. That code was the beginning of issues. NOW I not only get that code but I also can not send or receive texts or calls!!! When I send a text it just says sending but nothing happens. When I try to make a call I get the message 'not of registered network'. Even when I am on Wifi I can't send/receive calls or texts. The only thing I can do ON WIFI is use the internet. If I turn wifi off no internet. It is as if the SIM card is not communicating with tmo service. I do not get a SIM card error. I have pulled the sim and battery. I do have mobile (data) on and Roaming on. HELP! My phone is unusable!!!
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