So my problems so as follows. In the morning I use my data, go on some website, then turn it off. Maybe 5-6 hrs later I decide to use it again, guess what I just doesnt work. It literally stops working by itself. I tried everything I can think of. Restting all setting, reset network settings, and I even did a full restore and updated to 3.1.3. Still doesnt work. I see the carrier logo, 3g logo, and full bar signal strenght. I cant make phone calls or surf the web using 3g. Im going to see my carrier tomorrow. What can I do now?