rk007b What is the point of the setting if I have to manually update google settings ?
Because the Android phone you bought uses software provided by google. giffgaff cannot override the phone settings that you are in charge of. You have to enter the settings but chances are, the user will be savvy enough to bypass them in less than a minute.
You cannot un-invent the wheel.
Education is key to how the phone is used and continued vigilance by the guardian.