Ok, Today I am sitting at work with phone on desk, and suddenly i notice a message popup on screen ' could not acitvate cellular data network' . I look at top of screen and see it still has 5 bars and 3G so figure its nothing , ok the error and continue with my work. Later I try to use the internet and even with 5 bars and 3G at top of screen it pops up again and I cannot do anything internet wise on phone. I have tried turning phone on and off twice, tried resetting network settings twice, checked data settings and they are same as they have always been. What on earth is going on? How do I fix this?