I had a couple of my consultants (we issue SP3's to the consultants) blow through their data on their wifi 4G modems since the installation of Windows 10. It was only after a bit of investigation that we discovered the default setting under Windows Updates - Advanced Options - Choose How updates are delivered where it is defaulted to go to all PC's instead of only PC's on your network. Whilst I understand (and like) what Microsoft has done with this, I'm a little unappreciative of the fact that this was switched on by default to all (i.e. pc's on the internet and not just on your network). For most of the consultant's using wifi 4G modems, we've discovered the usage due to this little headache has actually been pretty heavy. Whilst you can set a device to be a mobile device, wifi devices aren't set to this by default.