I\'m setting up some tests and it will require a decent number of phones to be usb tethered and configured. I\'ve been successful in configuring them the way I want to once
For Fairphone 2 with Fairphone Open OS (the "Android without Google" version, which is not installed by default) you need to:
adb shell su -c "service call connectivity 31 i32 1"
adb shell su -c "service call connectivity 31 i32 0"