Nowadays, the iterative speed of upgrading electronic products is getting faster and faster. Many people have many old mobile phones and computers in their homes. How to deal with these discarded electronic products has become a difficult problem. According to the survey on the status of old electronic products in 2021, 62% of consumers have 1 to 3 old electronic products, and 38% of consumers have more than 3 old electronic products. Recycling is a common choice for waste electronic products. However, in reality, some recycling agencies are not professional and thorough in data cleaning of electronic products, and even do "business" in data recovery, which increases the risk of personal information disclosure of citizens, and violations of personal privacy occur from time to time. In view of this, many people are unwilling to sell their old mobile phones and computers even if they are piled up at home. A large number of discarded electronic products are not only a waste of resources, but also a threat to the environment. How to let people safely sell old mobile phones and computers has become an urgent problem. Restoring factory settings does not mean completely deleting the message "I really don't know what to do!" Xiao Wang looked at more and more old mobile phones at home, a little worried. With the acceleration of the updating of smart phones, Xiao Wang has changed a mobile phone on average in two or three years, but the mobile phone is "only in and out", and there are four old mobile phones in his home. If the old mobile phone is not handled properly, it will bring great harm to the environment. For example, an old mobile phone battery can pollute 60000 liters of water, and the pollution intensity is 100 times that of an ordinary dry battery. It also contains lead, cadmium, mercury and other heavy metals that can easily pollute the environment. At the same time, many components of old mobile phones are rich in precious metals such as gold and silver, and have great potential for reuse. In this sense, recycling is the best choice. It is understood that there are generally three destinations for recycled old mobile phones: newer or less damaged ones will flow into the second-hand market after renovation; If there is some damage, the available parts and components are disassembled and reused; Completely unusable and can be used to refine raw materials. Most people's old mobile phones are idle at home. According to industry data, the number of mobile phones in China will reach 1.856 billion in 2021. On the one hand, the production and idle volume of old mobile phones are increasing year by year. It is estimated that the total idle volume will reach 6 billion during the "14th five year plan". On the other hand, the recycling rate of old mobile phone resources is only about 4%. There are many channels for recycling old mobile phones. Why do people prefer to leave them idle rather than sell them? "Idleness is a waste of resources, but the thought that recycling might leak personal privacy made me quit." Xiao Wang said frankly. Fear of personal information disclosure has become an important reason why many people are unwilling to sell old mobile phones. With the popularity of smart phones, mobile phones are no longer a single purpose communication tool. They carry more and more functions and increasingly become personal user information terminals, storing a large amount of personal information. "There are not only private information such as photos, videos and chat records of my family and friends, but also various investment and financial management, mobile banking and payment software on the mobile phone. Once used by illegal elements, it is too dangerous." Said Mr. Liu, who lives in Nanhu Zhongyuan community, Chaoyang District, Beijing. In order to better protect personal privacy, more and more people click "restore factory settings" or delete files one by one before selling old mobile phones. Is this operation really normal