Samsung recently started to roll out the December security patch for the Samsung Galaxy Note 8 and now the T-Mobile version of the handset has started to get the update.
The update was previously released in Europe and now it has landed on the T-Mobile version of the Samsung Galaxy Note 8 in the US.
The update includes Googl’e December security update for Android and it also comes with some other bug fixes and performance improvements.
The update should be available for your Galaxy Note 9 on T-Mobile as of now, you can check to see if it is available from the settings menu.
Source TAS