Windows Central reviewed the GameSir X2 USB-C controller
A quote from the article:
Thanks to Xbox Game Pass, we can now play a variety of Xbox games right on our phones via cloud streaming. Typically I prefer tablets for Xbox Game Pass cloud streaming, for their larger displays, but sometimes you just don't want to carry a large tablet around alongside a controller.GameSir X2 USB-C controller Review
The best way to use Xbox Game Pass mobile right now is typically on a phone, using a gamepad clip like the Razer Kishi. The Kishi is a little on the expensive side, and fits only a small subset of Android devices. What if there was something that worked with practically any Android phone? This is the 40% cheaper GameSir X2, arguably the best phone clip for gaming that I've ever used.