Why do I have unread messages on my mobile phone, but I can see them in my inbox instead of displaying them?

1. When the SMS box is full, it is necessary to delete useless messages and free up enough space to receive them. Or there are messages you haven't seen before, look them up one by one in the message list and click Open.

Secondly, some mobile phones use an icon for all SMS, MMS and push messages, which is actually not unread SMS, but may be unread messages in MMS or other mailboxes.

Finally, back up important emails and other information and empty all mailboxes.