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Re:The growing body of evidence that digital distraction is ... by prawn on Monday January 08, 2018 @04:35PM (#16100831)
This would be a phone for the kid that was locked into basic mode during school hours and then maybe unlocked on weekends or for a game session.

Once upon a time, kids went to school without phones, so it is possible...

Re:The growing body of evidence that digital distraction is ... by DavideNL on Monday January 08, 2018 @06:30PM (#16101951)
There's some of that in iOS: "Settings -> Restrictions", which will be locked by a passcode.

It has a lot of options, but probably not enough (like restricting specific apps.) You can however set to allow only apps rated "4+ years, 6+, etc.

Time limitation is possible too, via "Settings -> Accessibility -> Guided Access".