WikiWealth

"Korea has begun to experience problems with their teenager groups due to increase in cell phone technology. The average Korean school student between the age of nine and nineteen sends more then a 100 SMS text messages a day,causing them to perform poorly in school. The wide use of cell phones in this country has caused a massive strain on the historic culture of South Koreans. South korean teenagers have been sucked into the world of their cell phones forgoing visual conversations with fellow teens for picture and text messages."

Sources:

http://internationalbusiness.wikia.com/wiki/South_Korea_Cell_Phone_Technology