Article updated: 9/10/2012 1:02 PM

T-Mobile launches campaign to lure iPhone users

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T-Mobile USA, the only "Big 4" phone company that doesn't sell the iPhone, now wants to snag used ones from AT&T. Starting Wednesday, when Apple is expected to reveal a new iPhone model, T-Mobile will start advertising that AT&T iPhone owners who are out of contract can switch to T-Mobile. "We expect that consumers will start trading in older devices," said Harry Thomas, T-Mobile's director of marketing.