Can I use my iPhone 6s Plus from Sprint and bring it to T Mobile?

Can I use my iPhone 6s Plus from Sprint and bring it to T Mobile?

Added (1). What one of the workers told me was that, although the phone was completely compatible with the network, because Sprint runs on CDMA and Tmobile runs on GSM, even if I were to get my phone unlocked, it might not work 100% on the network all the time as opposed to using a phone purchased from Tmobile itself. Now I was kind of skeptical at first, thinking he's just saying this so I would have to spend a kidney on an entire new phone, but is this really true?

The 6s is when they started to have SIM-free so it is likely that an Unlocked iPhone from Sprint 6s, 7, or SE could work on T-Mobile but I would have talk to T-Mobile first.
https://www.t-mobile.com/...patibility

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