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I use the AT&T prepaid service as well (GoPhone) on a factory unlocked smartphone; I don't use the data, but have the ability to turn it on if I need to.

As it turns out, one can just get a GoPhone sim at an AT&T store and get it activated then and there (no need to take a dumbphone or your smartphone there at all). The sim costs 99 cents. I have been using this sim for the past 6 months.

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The last time I checked, you couldn't use a GoPhone SIM in an iPhone, period (though this could have easily changed, especially now that T-Mobile is deep into their refarm). Easily the #1 complaint of international iPhone users visiting the US.

Correct. Some of the bundled packages have SIMs on plans that are IMEI locked and you can't pop them into better phones and have them work. A friend and I got burned on that.

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