Explanation:
The current functions that require SIM card activation include:
1. Free Internet SMS;
2. "SMS synchronization" in MI cloud service;
3. "Call record synchronization" in MI cloud service;
4. "Find phone" in Mi cloud service;
When the SIM card is activated, a text message is sent. All functions only need to be activated by sending a short message, which will be completed by the system automatically. When the function is used for the first time, a popup prompt will be given to the user to choose whether to send a short message to use the function.
Notes:
1. The above functions will enter the SIM card activation process when they are first turned on;
2. After resetting the phone, if the above functions need to be continued, the SIM card will be reactivated;
3. If the same SIM card is used on other new devices and the above functions are enabled, the SIM card will be reactivated.