OK, for some reason when I have wifi turned on I cannot send or receive calls or texts. When wifi is off the phone performs fine. I'm on Att. Normally the hspa indicator is a white square with a blue "H+" inside of it. When I turn on wifi the "H+" turns black and I can no longer send or receive text or calls. Wifi works fine as I can get online and everything else. Anyone have a clue what the problem is??? I've called Att and their tech ppl r morons.