Will the AT&T iPhone 6S work on T-Mobile?

fflip8

    The iPhone model I'm talking about is the A1633, which is different from the T-Mobile sold one I think.
    Will band 12 extended range coverage work on the phone, with data, voice and texting?
    Will WiFi Calling and HD voice work?
    Also, will I experience any other differences between a T-Mobile sold iPhone 6S compared to an AT&T one?

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