A prior leak suggested that OnePlus would sell an upcoming phone, the 8, through the US carrier Verizon. Now, an analysis of code in this OEM's launcher for Android appears to back this up. It also points to a T-Mobile SKU of the same phone.
https://www.notebookcheck.net/The-OnePlus-8-may-be-available-through-both-T-Mobile-and-Verizon.456055.0.html