https://www.cnet.com/news/black-friday-phone-sales-2018-free-oneplus-6t-lg-v30-for-430-moto-g6-for-200-plus/

If you already have one or more phone lines through T-Mobile and add another and trade in an old phone, the carrier will give you a new OnePlus 6T phone to use for the additional line. This is one of our favorite phones for 2018 for its excellent performance for the price. A price of "free" is even better.

The sale begins Nov. 16. Read T-Mobile's fine print here.