Apple 13 SMS is displayed twice.

Click to open the settings of Apple's mobile phone and enter the settings page. Slide down to find the feedback option, and you can see it directly when you set it up. After the notification opens, drop down, find the "Information" option, and click it. On the information page, find the "Repeat Reminder" option and click. Click "Never" and check. You will only be prompted once when you receive a text message.

If some information reminds you that you need to repeat the reminder many times, you can follow the above operation.