How do I use unlocked OnePlus 3t with t-mobile?


    I recently purchased a OnePlus 3t (new, unlocked). I've never bought an unlocked phone and used on t-mobile before. What is the procedure exactly? I have an HTC One M8 on my t-mobile account. Is the proceedure that I need to take the simcard from my HTC and put it in the Oneplus and then just turn it on and that's it? Or do I need to take it into a t-mobile store?


    What do I need to do exactly?



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