The moment of levity underscored how the two leaders had grown closer during a series of encounters over two days, the South Korean president's spokesman said.

Xi presented two Xiaomi smartphones fitted with Korean-made displays to Lee, who quipped: "Is the communication line secure?", drawing laughter from Xi.

Earls Barton Primary School in Northampton introduced a smartphone ban at the start of this academic year. Maggie, 10, who is ...