Using unlocked phone on Tmo

I'm a Tmo customer, and i'm not planning on switching. That being said, i would like to know their policy on bringing a non tmo phone to their network. When my S7edge is paid off, i'd like to buy an unlocked Pixel 3XL and use it on tmo. Do they have a special plan for this? I have the Tmo One + 55 plan, and i'd like to keep it, if possible. If there are any tmo reps out there, or anyone who has done this, please let me know how to set this up. Thanks for any help.

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