I have the same problem and I can tell you there is no relation between a no at&t signal and a wi-fi connection because I have a hacked phone and it works fine with my home wi-fi network.
Now what's weird is the hotspot wi-fi network I'm trying to connnect to is open with full signal. I have side by side my iphone and my t-mobile Dash. The Dash connects fine to the network but the iphone doesnt.
Have tried resetting everything too, totally weird..
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