C hina wants to limit children to just one hour of smartphone use per day as it widens its crackdown on gaming. The country’s powerful internet watchdog has outlined plans that would force phone and tablet makers to introduce a “minor mode” on their devices. Echoing restrictions already in place for video games, the new controls would essentially prevent under-18s from accessing the internet between 10pm to 6am. The severe rules come as more countries are grappling with the disruption caused by smartphones to education. In recent weeks, UK schools minister Nick Gibb said mobile phones should be kept out...