https://www.cnet.com/news/huawei-mate-10-pro-coming-to-at-t-firmware-shows/

Huawei is the biggest phone brand you've never heard of. But that second part could change soon.

Code found by XDA Developers indicates a version of Huawei's latest premium phone, the Mate 10 Pro, will be sold through AT&T. The firmware in question showed a Mate 10 Pro loaded with AT&T's apps and software.