Can I use this phone?

I would not recommend using this primarily CDMA-based device. You would have coverage only in areas where at&t still has 1900 MHz GSM coverage.

I hope this helps. 🙂

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@Blue4Life wrote:
I would not recommend using this primarily CDMA-based device. You would have coverage only in areas where at&t still has 1900 MHz GSM coverage.

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And no 3G capability, either.  Really, its a poor choice for use on AT&T's network.