At the tail end of 2015, AT&T ran a buy one, get one promo on Apple and Samsung smartphones. Now a similar deal has launched in time for Valentine’s Day.

Starting today, AT&T is offering a buy one, get one free deal on several flagship smartphones. The deal is open to both new and existing customers, but only the first phone can be bought as an upgrade, which means that the second phone must be part of a new line. Additionally, both phones must be purchased on AT&T Next, and the new line must be on AT&T Next 24.

One other detail that’s worth noting is the way that the cost of your second phone is covered. Once you’ve selected your phones, you’ll begin receiving bill credits to cover the cost of the second device. The credits will begin appearing within three billing cycles, and you’ll get 30 monthly bill credits worth up to $650.

By now you’re probably wondering which phones qualify for the deal. They include the iPhone 6s and iPhone 6s Plus, LG G4, LG V10, Samsung Galaxy Note 5, Samsung Galaxy S6, Samsung Galaxy S6 edge, Samsung Galaxy S6 edge+, and Samsung Galaxy S6 active. The two phones that you choose must come from the same manufacturer, so you can't get an iPhone 6s with a Galaxy Note 5 or a Galaxy S6 active with an LG V10.

AT&T isn’t saying how long this deal will run, only that it’s a “limited time offer.”