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@CommonSenseGent @JeSsA Unfortunately if you're running a stock Samsung rom there are actual useful TMobile functions that will not work, like the option to do video calls straight from the phone app with other TMobile users, HD audio on phone calls, and even common features like WiFi calling don't work unless using the carrier rom. If that stuff is important to you then the best you can do is force stop and disable the bloatware from the app manager in settings.
@CommonSenseGent @JeSsA I've purchased my Notes unlocked from Samsung since the Note 8, to use with my att service and wasn't able to use the previously mentioned services with att either (they totally could allow that functionality but refuse to do so) so when we saved a ton of $ by switching to an unlimited 1st responder plan with TMo I just purchased my Note 20 from Samsung configured with the TMo software and disable the annoying add on apps as they pop up.