Huawei concluded talks with AT&T a few months ago, and it looks like the Mate 10 will be the first device to benefit from that partnership. Only the Mate 10 Pro, though, as Huawei, once again, ignores the regular Mate 10 .
https://www.notebookcheck.net/Huawei-Mate-10-Pro-heading-to-the-US-under-the-AT-T-umbrella.262818.0.html