Android - Child-proofing an Android phone?

1. Activate Fixed Dialing Numbers feature from Call Settings (and, add numbers there to allow). You may need to contact your carrier. This is supported by even classic Nokia phones, so all ROMs should support it.

2. Kiosk lockdown the device and allow only Phone/Dialer app in Kiosk Mode. For Kiosk Mode, try searching "Kiosk" in Play Store. SureLock Kiosk Lockdown app looks great to me.

Don't forget to allow kid apps other than phone in Kiosk Mode. Happy Parenting!

Google has Family Link which allow for some restrictions on the child's device.

• Approve/disallow apps
• Screen time limits
• Location - find child's device

The full list of features is here: https://support.google.com/families/answer/7158477

A few limits:

• Child account at 13 years can choose to leave Family Link
• Website filtering is limited to Google's SafeSearch & related filtering tools.
• Will still see ads

Google Family Link FAQ

Parents should review Google Family Link FAQ and see what data collection is acceptable.