DISUSED SMARTPHONES RING WARNING NOTE

Devices contain toxic substances, posing health threat if not disposed of properly

Shao Heng, who works for a cellphone recycling company in Beijing, feels he is in a privileged position.

"I can always keep abreast of the latest mobile devices through my job," he said.

Numerous electronics enthusiasts join long lines to buy the latest handsets, but some of them visit Shao's store to sell their devices soon afterward, said the 28-year-old, who works for the secondhand platform Aihuishou, which is headquartered in Shanghai.