There is a string of numbers on the mobile phone box! The salesperson posted it when you bought a mobile phone! That number is a network access license. You can use this license number to track the center number in your mobile phone! We'll find out where your mobile phone is then. If someone finds it, they can know what the current mobile phone number is and ask him to return it! If you are a mobile user, go to the mobile hall! Unicom will go to Unicom! And bring your ID card and relevant vouchers (such as invoices, etc.) for purchasing mobile phones! .