https://consumerist.com/2017/09/06/t-mobile-throws-in-free-netflix-for-users-with-family-plans/

Millions of T-Mobile customers with family plans of at least two lines will soon be able to watch Netflix for free, as the wireless company announced today that it will include a free Netflix subscription for these multi-line plans.

Starting on Sept. 12, 2017, folks with T-Mobile ONE family plans with at least two lines will be able to have T-Mo cover the cost of the most popular Netflix account ($9.99/month). The offer will be available to both new and existing T-Mobile subscribers.