How can you display unread messages when all the messages are deleted?

The reasons are cache problems and incomplete deletion.

1. Cache problem: The mobile phone may cache some data to improve system performance. If the information is deleted, but there is still a record of the information in the cache, the phone will continue to display unread information.

2. Incomplete deletion: In some cases, even if the "Delete" option is selected and a confirmation message is received, the short message is actually moved to the trash can or recycle bin, but it is not completely deleted from the device.