Windows 10 has been programmed to stop automatic updates when you're on a metered connection, so if you connect using a usb modem it won't automatically update your system, but if you use a wifi hotspot the system will not recognize it as a metered connection and that's how your data will be drained on updates, so in other to avoid this i will show you how to set your wifi to be recognized as a metered connection.

Enabling the option stops your Windows 10 installation from downloading the updates. To enable the setting, bring up the Start Menu and perform a search for Change Wi-Fi settings. Open the resulting option and navigate to Advanced Options. Locate the Set as metered connection toggle and enable it.



Once you’ve switched the toggle, updates will no longer be pushed to your system by Microsoft, since you’ve explicitly specified that you’re on a metered connection and wish to conserve your data plan. However, the option is only viable for users who exclusively use Wi-Fi to connect to the Internet. If you use an Ethernet cable for Internet connectivity, this option will make no difference.

And that's it very simple.