To stop automatic windows updates on windows 10 when using a cell connection, do the following while connected to your cell/hotspot/jetpack:
Go to windows settings
Select "Network and Internet"
Select "Change Connection Properties"
Change the slider that says "Set as metered connection"
Done!
You may get nag messages about system and antivirus updates, but it gives you back control over when they occur. This needs to be done for every wifi source you use, such as each hotspot, your phone or the spouse's phone. Any new wifi that you connect to such as a friends S&B wifi or the library will then run all your updates .
Cheers,
Dave