Starting today through Dec. 7, AT&T customers can save $100 or more on their new smartphone when they trade in an old handset. The deal only applies to "select AT&T smartphones" including the HTC One and Samsung Galaxy S4 and most smartphones priced at $199.99 with a two-year deal. AT&T won't accept phones more than three years old or devices that are not in "working condition."

To take advantage of AT&T's offer, head to the nearest brick-and-mortar store with your old smartphone. In return for the old device you'll receive a $100 coupon that can be used immediately to purchase a new smartphone, connected tablet, accessory or to simply put towards your monthly bill.

The company offered a similar discount back in April, but with the holiday season at hand and a new fleet of smartphones available, AT&T is bringing back the popular program.