How to solve the problem of displaying unknown numbers

The unknown number is displayed because the caller ID service is not enabled on the mobile phone number. Taking the mobile phone number as an example, the business steps of inquiring about the opening of caller ID are as follows. First, you need to prepare a mobile phone with Sichuan Mobile App:

First, open Sichuan Mobile App on your mobile phone and enter the main interface of the program.

2. In the toolbar of the program interface, click More to enter more service interfaces.

Third, drop down the menu in more service interfaces, then find online customer service in the service and enter the online customer service platform.

4. Enter the caller ID in the dialog box of the online customer service platform.

Fifth, customer service Xiaomi will have a way to turn on the caller ID, that is, "edit the short message KLDXS to 10086 to turn on the caller ID function".