Lost repair, that is, lost person information repair. Mainly relying on the three major carriers, mainstream logistics platform data, under the premise of ensuring data privacy and security, the use of Internet big data analysis technology, through the encryption of identity card information to repair the lost person's effective communication cell phone number, using desensitized data to provide a set of outbound call or SMS touch services; or through the encryption of identity card number or cell phone number to repair the lost person's effective communication address, not return to the real address, and provide a key to send paperwork letter touch services. Provide a key to send paperwork on behalf of the reach service.

Operator Repair: At present, the three major communication operators (China Mobile, China Telecom, China Unicom) all adopt the real-name system to open their businesses, so the big data analysis using encrypted ID card information is an effective way to repair the cell phone number of the lost person. By means of data encryption (the encryption method stipulated by the CBRC is MD5 and SHA256), the operator service is requested to repair the lost person's on-net cell phone number, and then the output is processed by desensitizing or encrypting, i.e., the lost person is reached through the virtual number/web page outbound call system/mass lost repair SMS. On the premise of meeting the authorization of the lost person and the authorization of the bank (the data belonging to the unit) (known as dual authorization in the industry), to achieve the compliance and legality of the business, so that the operator of the business is only open to the banks and financial licensed institutions, the collection agency usually needs to sign a commissioned collection agreement with the bank and provide the authorization documents stamped by the bank in order to be able to do so.

Non-operator fixes include Internet companies that illegally collect cellphone numbers, companies that use crawlers to illegally obtain user information, and companies that cooperate with operators and own cached data packets. Compared to carrier restoration, non-operator restoration is less accurate and less expensive, less time-sensitive, and does not require authorization from the bank (the unit to which the data belongs). Non-carrier restoration is usually associated with greater legal risk. First, there is no legal authorization to obtain information about the lost person, which violates the privacy of the lost person; second, there is no encryption of the data, and the data is provided directly to the collection agency in plain text, which leaks the private data of the lost person; third, there is no authorization from the bank (the data belongs to the unit), and the bank's collection contract generally stipulates that it is forbidden for the collection agency to entrust the third party to deal with the customer's data it has obtained.