iOS has excellent controls so we locked down an old iPhone for our kids, 5 and 8, to use to listen to audio books (connected to my wife's library card), take pi

iOS has excellent controls so we locked down an old iPhone for our kids, 5 and 8, to use to listen to audio books (connected to my wife's library card), take pictures, add notes and sketches, and add contacts with all their friends' names (no voice or text). One picture got posted to Facebook before we figured out the OS was still logged in to Facebook despite deleting the app. They do ask when they can have phones. In their wildest dreams they would text and call their friends all day long, so thankfully the brain warping stuff has not entered the picture yet. They know it's a long ways off, but they are curious and want to get a sense of the time frame. For now we stall and talk about the risks and responsibilities with them while we gather data such as referenced in the OP. Unfortunately Android's controls are pathetic, at least in v4 which we had. One of the kids got into the play store and downloaded a bunch of princess and pet type games one day. No harm done but the whole situation raised great lessons for everyone.