AT&T is currently running a promotion for the holiday season on the Samsung Galaxy S6, offering buyers the option to score one for free when purchased alongside another current Samsung phone. If you plan to buy a Galaxy S6, S6 Edge, S6 edge+, S6 Active, or Note 5, you'll be able to grab an extra Galaxy S6 for free. Of course, there are a couple of caveats to this deal to be aware of.
First, you must be starting a new line of service to be eligible for the free 32GB Galaxy S6, and both phones must be purchased using AT&T's Next installment plan, with the free phone requiring a Next 24 plan specifically. Additionally, the "free" part of this offer isn't up-front: AT&T will issue bill credits each month over 30 months covering up to $650.
Still, if you're planning to add another line to your plan and are okay with the caveats, this isn't a bad way to save a bit of money. The offer runs through December 31, and you can check out more from AT&T at the link below.