T-Mobile's Binge On can be enabled or disabled using your phone's dialer
T-Mobile subscribers can use self-service codes to enable or disable Binge On
If Binge On is enabled and you want to turn it off, you can dial #263#. If it is disabled and you want it on, dial #266#. We should point out that some subscribers of the nation's third largest carrier have gathered on Reddit and revealed that these codes didn't work for those sporting an iPhone until Wi-Fi calling and VoLTE were disabled.
And speaking of disabling things, it is very important for T-Mobile subscribers to understand that if they disable Binge On, they will lose the three months of unlimited data that the carrier gifted to subscribers. The gift expires on March 1st.
source: Reddit
Things that are NOT allowed: