I think they have two versions: T-mobile version and Sim-free. The T-mobile version is locked. It can be unlocked after you call the carrier. The Sim-free version is unlocked, can be used on AT&T, but its band is best suited for world. http://www.apple.com/iphone/LTE/ If you look at iPhone 6 above, Model A1549 (GSM) is for AT&T and T-mobile, model Model A1586 (GSM) is for the world (Sim-free and unlocked). More details here: http://www.redmondpie.com/the-difference-between-unlocked-t-mob
【在 m*****u 的大作中提到】 : I think they have two versions: T-mobile version and Sim-free. The T-mobile : version is locked. It can be unlocked after you call the carrier. : The Sim-free version is unlocked, can be used on AT&T, but its band is best : suited for world. : http://www.apple.com/iphone/LTE/ : If you look at iPhone 6 above, Model A1549 (GSM) is for AT&T and T-mobile, : model Model A1586 (GSM) is for the world (Sim-free and unlocked). More : details here: : http://www.redmondpie.com/the-difference-between-unlocked-t-mob