Android’s state is Air Plane mode but it can send and receive call when connect to Windows 10 through USB.
follow step to verify this problem.
1. USB unplugged and go to Windows 10 "Settings" --"Status"--"Change adapter option"
2. Disable "Mobile network(Qualcomm HS-USB WWAN Adapter 9091)" network adapter.
3. Turn on "airplane mode" then connect USB.
After disable the "Mobile network" network adapter, in airplane mode, "Device Modem" will not change when USB unplugged and plug.