Both the Samsung Galaxy S4 and the HTC One are priced at $199.99 with a signed two-year contract, which means that the minimum $100 you will get for your old handset could cut the price of your new phone by more than 50%. And remember that the $100 is just a floor. Depending on the model and condition of your trade, you could get back more than a C note from AT&T.
The trade-in can not be older than three years and must be in working condition. If you bring your old smartphone into a company owned AT&T retail location, you will receive a minimum $100 promotion card immediately upon making your smartphone purchase. The card can be used toward the purchase of a new phone, connected tablet, accessories, or you can even use it toward your monthly AT&T invoice.
The trade-in offer expires on December 7th, so don't wait for the last minute!