I have a T-Mo device too and you can open up Settings>Application Manager and disable a lot of the built-in apps safely. I've done it to the Tmo TV app, voicemail, and device unlock, as well as, both Facebook and Amazon. Lookout. I like Lookout. I've left the hotspot app (useful) and the T-Mobile app (this one cannot be disabled unless your device is rooted which I don't recommend) enabled.
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