I own an Android phone (a Nexus 5, so it's "standard" Android) and use it with a very limited data plan. Sometimes it downloads huge updates over the mobile network, even though it's at home and could use our Wi-Fi.
I haven't caught it in the act, so I don't know if the updates are for the operating system itself or the apps.
Is there a setting I can use to configure the phone to download software updates exclusively via WiFi?