Apple has added the option to purchase SIM-free, unlocked iPhones to its web site. The iPhone 6s (model A1633) and iPhone 6s Plus (model A1634) are compatible with a wide range of LTE networks, including those of AT&T, T-Mobile, and can be used on any GSM network in the U.S. or abroad. The devices are sold at full cost, without carrier contracts or obligations.


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