When I plug my phone via USB A or USB C, the Surface Book 2 doesn't acknowledge the device. The device will charge but that is it. No it's not a phone issue, since when I connect my phone to other computers, the computer recognizes and the phone asks about Tethering. I've downloaded my phone's drivers on the SB2, as well, it seems no matter what I do I can't get the SB2 and my phone to connect via USB.