Update, 4/2: This offer ends tonight at 11:59pm PDT!
Originally posted on 2/27:
They will also offer the MLB.com At Bat Premium app for free, a $19.99 value.
Once you’re registered for MLB.TV you can use the account on multiple devices simultaneously.
Note that streaming games from non T-Mobile phones can lead to the free subscription being terminated, though you can signup from a T-Mobile phone and then stream from non-phone devices.
T-Mobile offers 4 lines with unlimited talk, text, and data for $140/month including all taxes. T-Mobile also gives a free Netflix subscription to their users, just login to your account to signup for free.