https://www.cnet.com/news/t-mobile-black-friday-2017-bogo/

Starting Friday Nov. 17, anyone who buys a new flagship phone from T-Mobile can get another phone of equal or lesser value for free -- through a rebate -- after adding a line of service. You can't buy just any phone, but the ones that do make the cut are some of the most popular devices of the year from Apple, Samsung and LG.

The buy one, get one (aka BOGO) includes: