China might put further limits on kids' smartphone use. The Cyberspace Administration of China (CAC) has proposed draft rules that would cap the phone time of children under 18 to a maximum of two hours per day. That's only for 16- and 17-year-olds, too. Youth between eight and 15 would be limited to one hour per day, while those under eight would have 40 minutes.

The draft would also bar any use between 10PM and 6AM. Phones would need to have an easy-to-access mode that lets parents restrict what kids see and permit internet providers to show age-appropriate content. Children under three would be limited to songs and other forms of audio, while those 12 and up can see educational and news material. There would be exceptions for regulated educational content and emergency services.