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  • Your Z3 might support AT&T LTE.

    If it has a model number D6603 or D6643 it should be fine.

    All models should support AT&T 3G and 2G.

    To find the model number and name of your Xperia™ device

    From your Home screen, tap the Application screen icon.
    Find and tap Settings.
    Tap About phone/tablet > Model number.
    
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