iPhone 4S is quad-band GSM, and CDMA. "As a result of an upgraded radio chip inside the phone, in addition to being a world phone <https://en.wikipedia.org/wiki/World_phone>, both GSM <https://en.wikipedia.org/wiki/GSM> and CDMA <https://en.wikipedia.org/wiki/Code_division_multiple_access> customers can roam internationally on GSM networks." There are 5 different GSM 5S models, radios vary. You'd have to make sure you got the right one.
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