My samsung galaxy s III would always connect to mobile network and work fine. I have the $45 unlimited web and data plan. But for a few days now I will turn on the mobile network while I'm out because I need internet but it will not work. I've tried in many areas so I know its not the area I'm in because its worked here in the past. I just got the phone about three weeks ago. Wifi works perfectly fine, it is just the mobile network. Im not sure what is wrong. Any ideas? Thank you