What if the SMS is lost?

Solution:
1. First of all, it is necessary to under normal circumstances, the mobile phone will not have this problem. Please check what operations have been done on the mobile phone recently.
2. Whether factory settings has been restored or text messages are deleted manually.
3. If Mi cloud service has been activated and SMS synchronization is turned on, the messages can be recovered from the cloud.
4. If SMS loss occurs from time to time, it is recommended to restore factory settings after backing up the important data. Then observe whether it works normally without restoring the backup.