Card 2 cannot activate SMS location service.

Redmi mobile phone card 2 cannot be activated due to a setup error. The solution is as follows: 1. You need to enter the setting function of Xiaomi mobile phone, find it in the system tools and click to open the setting interface. 2. Then you can see more settings in the settings interface, and click, as shown in the figure. 3. Find and click to open the system security function in the More Settings interface. 4. Then you can see the device manager in the system security, and click to open this function. 5. The device manager is an application program that can activate the device manager. Click the application you want to activate. 6. After opening, it will explain what functions are available after activating the device manager. If you confirm that Device Manager is activated, click to activate it. 7. Finally, there will be several steps. Just click the step to activate the device manager.