https://www.cnet.com/news/cyber-monday-2018-phone-deals-nov-27-free-lg-v40-200-moto-g6-500-lg-tv-free/

T-mobile will give you an LG V40 or LG G7 when you activate two lines of service, and trade in an eligible device (see below). You'll see the discount in the form of 24 or 36 monthly bill credits. The eligible phones include:

Like a good two-fer? When you buy an LG V40 or LG V35 from AT&T on a new line of service through AT&T Next's installment plan, you'll get the second line for free... eventually. You'll recoup the cost of the second phone over 30 months of bill credits, which begin within three billing cycles. This is par for the course with carrier BOGOs and discounts, and you will save money over time.