Where do foreign junk mobile phones come from?

The process of foreign junk mobile phones from abroad to China is generally the United States or Europe-Hongkong-Shenzhen. American companies bid for a mobile phone at a time, and the starting price of a mobile phone with a market value of 8 thousand may be only 2 thousand-3 thousand. At this time, companies from Hong Kong and other countries will participate in the auction. After the auction, the mobile phone will be delivered to Hong Kong by cargo plane. At this time, the second-hand bosses in Shenzhen went out.