The received SMS is not marked as a reminder.

This is because the corner function of the icon is turned off.

Taking Huawei P 10 mobile phone as an example, the method to turn on the icon corner label function is as follows:

First, click "Settings" on the desktop of Huawei P 10 mobile phone.

2. After entering the setting interface, select the "Notification Center" option.

3. After entering the notification center, find the "icon corner" and click Enter.

4. Turn on the switch after entering the "All" column.