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Hi, My iphone 4 is not detecting ATT signal at all. It was all working fine til a coupla weeks ago and the problem started since yesterday. I was on a vacation to India for a couple of weeks and i am in the US now. The problem started since I returned to the US. My research said changing the sim might work but not sure if that would help. When I disable 3G though, my iphone seem to detect the att signal. Not sure if this is a phone problem or att problem. Please advise if any of you have faced the same problem as i do.
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