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Why do mobile phone stores need real-name authentication when collecting old mobile phones, and why should they restore factory settings?
This is to prevent the situation that the mobile phone is not your own, so you need to register your ID card to recycle the second-hand mobile phone. This can ensure the compliance of supply.
Because every mobile phone has a unique serial number, if someone loses it, the user will pick it up and sell it. If it is not registered, it will design security problems, which will make it impossible for merchants to use it when selling.