AT&T didn't allow those with off-contract iPhones to unlock them until April 8, 2012, so there was a few years there where you could have a paid-off device stil

AT&T didn't allow those with off-contract iPhones to unlock them until April 8, 2012, so there was a few years there where you could have a paid-off device still locked to AT&T. https://www.macrumors.com/2012/04/06/att-will-unlock-off-contract-iphones-starting-sunday-april-8/ https://www.macrumors.com/2012/04/06/att-will-unlock-off-con...