AT&T expands BOGO offers to more phones than ever before4
The process of securing your free BOGO phone works like this. New and existing AT&T customers can purchase the first handset using any of the AT&T Next offerings. The second phone must be bought using the 30-month Next plan, which is the AT&T Next 24. At least one new line must be added, and both phones must be made part of a qualified data plan like the AT&T Unlimited Plan or a Mobile Share Value plan.
After three bill cycles, you should start to see credits for the free device appear on your monthly bill. You will receive as much as $695 spread out over 30 months. That works out to a credit of $23.17 for each month. At the time of sale, you will be required to pay the appropriate taxes on the devices.
The bottom line is that as long as the second handset retails for $695 or less, it is free. Otherwise, you will be responsible for the difference between the retail price and the $695 credit you are receiving. The free device doesn't have to be the same exact phone purchased, but it does have to be made by the same manufacturer. The BOGO deals expire on June 30th.