Android
Turn Automatic App Updates On or Off auf Android
Automatic app updates keep apps patched against bugs and security issues without any manual work. On Android, this behavior is controlled inside the Play Store, not in the general system settings.
By default, Google Play tends to update apps only over Wi-Fi to avoid unexpected mobile data usage, but this can vary depending on carrier settings or prior changes on the device. If updates seem to happen on mobile data when you did not expect it, or apps stay outdated for too long, this setting is the place to check.
Where to change it
Open Play Store ➔ tap on your Google Account icon ➔ Settings ➔ Network preferences ➔ Auto-update apps. Then select Over any network, Over Wi-Fi only, or Don't auto-update apps and confirm with OK.
Choosing Over any network keeps every app current at all times but can use significant mobile data if you frequently update many apps. Choosing Over Wi-Fi only limits updates to Wi-Fi connections, which is a safer default for limited data plans. Selecting Don't auto-update apps stops all automatic updates, meaning you will need to update apps manually from the Play Store when needed.
This setting is available across recent Android versions and works the same way regardless of manufacturer, since it lives inside the Play Store app itself.