In addition to what LG_21 said you may be able to buy a pre-packaged GoPhone (like a Lumia 520 for instance) that comes without any plan and then activate the SIM at https://www.wireless.att.com/GoPhoneWeb/goPhoneLanding.do?method=activatePayGo. Haven't tried that way of activation in a while, but don't see why it wouldn't work.
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