The nail on Apple's tablet shows that the device does not support SMS.

The nail display device on Apple's tablet doesn't support SMS, because the nail on the computer has turned off the mobile phone notification. The solution is:

1. Check whether the mobile phone notification has been turned off, open the nail version of the mobile phone and click Settings.

2. After entering the setting interface, click New Message Notification.

3. After entering the new message notification interface, start receiving new message notifications.

4. Check whether the mobile phone has the notification authority to open the nail.