Wouldn't this take off?
It's preloaded with apps, no access to an app store.
It's got only the apps parents want on there. Say, phone calls, messages, WhatsApp, a location tracker, Google Maps. Maybe a child-safe music streaming app and Kids' netflix. A camera.
It's got a Web browser with strict controls, and a linked web-history tracker the parents can access remotely.
Maybe you could add more apps but only remotely from an appstore on the parents phone. All games blocked. All apps with in game purchases blocked.
Because it's got limited functions, it's got long battery life.
It's cheaper because it doesn't have silly high processing speed and camera resolution.
Wouldn't hordes of parents want this?! Why won't they make this! It would sell like hot cakes!! With the right glamorous advertising, the kids might even want it too.