What should I do if Apple 6 plus SMS flashes back?

First, close the SMS program. Turn off the automatic update time in the general time setting. Push back the date by more than 30 days. For example, today is May 3 1 day. Adjust the time after July 1 day. After entering information, set the retention information to 30 days. You will then be prompted to delete it. Click Delete. Check whether the information function can be used normally, and then reset the automatic time. If it doesn't work after deletion. See if the SMS program is off. It must be closed.