https://www.techradar.com/news/oneplus-may-partner-with-t-mobile-to-launch-the-oneplus-6t

OnePlus's half-way upgrade from the OnePlus 6 has yet to be officially announced, and though we've come across plenty of rumors about the OnePlus 6T, perhaps the biggest news for the phone is that T-Mobile will sell it directly through a partnership with OnePlus. 

The partnership, which was explained to CNET by people familiar with the arrangement, includes an October launch date, and it entails the OnePlus 6T being customized for T-Mobile's network. Though this would be an exclusive partnership, OnePlus is still expected to sell a standard version not tied to T-Mobile.