If its still under warranty take it back, and tell them you want another one. I had to return several of them before I got one that worked. AT&T told me it was the sim card then it was the battery, they replaced some many sim card I lost count. I tried all the different OS and nothing. I'm using AT&T OS 4.6.0. I tried 5.2 but the battery life was horrible.
Good Luck
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