Deal: AT&T offers a bunch of BOGO deals on Apple, Samsung and LG flagships1
Of course, the deal requires customers to buy both phones on AT&T Next. Also, both phones you purchase must be from the same manufacturer, which means you can't get the Samsung Galaxy S10 and Apple's iPhone XS Max. Finally, the BOGO deal requires eligible postpaid wireless voice and data service on both devices with at least one new line of activation.
Depending on the phone you want, the maximum credit you receive towards the second device can be higher or lower. For example, buying the iPhone XS Max, iPhone XS, iPhone XR, iPhone X, iPhone 8 Plus 256GB, and iPhone 8 256GB will get you a maximum credit of $750 towards the second iPhone you want.
Samsung fans, on the other hand, will receive a maximum credit of $750 when they buy the Galaxy S10e, Galaxy S10, Galaxy S10+, or Galaxy Note 9. As far as LG phone go, you'll be getting a whopping $950 credit when you buy the LG V40 ThinQ, and $830 for the LG G8 ThinQ, so basically you'll be receiving the second phone for free.