AT&T Delivers Value, Choice, and Flexibility with the New iPhone Duo - Backed by America's Best Guarantee.

<p>New and existing customers get our best deal on the new iPhone Duo, up to $1200 off, with eligible trade-in.1 Key Takeaways: More confidence with America's Best Guarantee: a promise to always do our best by customers, and to make it right if we don't—when the connection matters, it has to...</p>