The number will be cancelled and may be put back on the market after 90 days of arrears. This problem seems to have no solution for the time being. In most cases, telecom operators and website operators are not the same group of people. The real-name system for numbers is in name only. At the same time, telecom operators will not tell the website that the number has changed hands. For telecom operators that also operate websites, such as Fetion, after the mobile phone number is cancelled, the system automatically cancels the binding relationship between the cancelled mobile phone number and the Fetion account, retains all the information of the relevant account, and the system saves the Fetion account of the cancelled mobile phone number for 3 months. Telecom operators and website operators are not the same group of people. This is the most common situation. For example, on Renren, the password can be directly retrieved on the security phone without verifying the username. This is very dangerous on Taobao. If you have used this number to shop, you can also retrieve it directly without verifying the username. How to solve it: It is basically unreliable to rely on telecom operators. Websites should strengthen the associated verification. If you forget your password, you need username + mobile phone; if you forget your username, you need password + mobile phone.