T-Mobile has another Buy One, Get One (BOGO) offer, resurrecting a similar deal it has launched throughout 2016.

The Magenta Un-carrier is now offering a BOGO deal for Samsung Galaxy smartphones, which means when you buy one, you can get the other Galaxy-branded smartphone at no additional cost. That includes the Galaxy S7, Galaxy S7 edge, and the Galaxy Note 5. It also includes the Galaxy S6, Galaxy S6 edge, Galaxy S6 edge+, and the Galaxy J7.

The deal begins today, December 22, and it’s open to both existing and new customers. To get the offer, the customer needs to activate two lines with the company’s T-Mobile One plans. You’ll need to pick out the two devices you want, and then go through T-Mobile’s Promotions page. The promo code is “HOLIDAYBOGO,” and then you’ll need to fill out a good old-fashioned rebate form.

Once that is all complete, T-Mobile will send you a prepaid MasterCard, which covers the cost of that second device.

The deal is a limited-time event, so if you plan on switching carriers and want a free phone, act quickly.