Google Play Services gms = Google Mobile Services It is a layer that sits on top of the OS and provides a bunch of Google APIs, giving apps access to various Google Services. If you remove it all the apps relying on Google Play Services whill either: - detect the lack of play services and refuse to run - detect the lack of play services but allow you to run (improperly) by dismissing an annoying popup Removing Google Play Services can bootloop some devices, so be careful. Disabling this package will improve battery life a lot. IMPORTANT: You need to uncheck Find My Device from the "Device admin apps" settings panel to be able to disable this package. Search "admin" in the settings search bar.
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