Galaxy Note 4 and Note Edge on T-Mobile get October 2016 Android security patches
T-Mobile units are receiving the 251MB over-the-air update as we speak, and it contains bug fixes and optimizations in addition to the security patches. T-Mo is keeping a good pace with Samsung, as Verizon, for example, only published the September 2016 security patch for these devices a week and a half ago.
If you are on T-Mo's network and haven't received the update yet, do a manual check by going to the Settings, System, About device, System updates menu and tapping Check for new system update. Alternatively, the smartphones can be updated through a computer by using Samsung's Smart Switch desktop app.