How to unsubscribe when he sent me a text message?

Enter the phone's settings (also called settings), find the application manager under the device, and click to enter.

If you find a software that you want to turn off push messages, you can see its memory usage and click to enter.

In this way, you can see the application information. Under forced stop, you can see the check mark before displaying notifications, which proves that the application is displaying notifications.

Cancel the check mark before displaying the notification, so that you can cancel the push message of the app.

On the contrary, if you need to push messages from certain applications, find the application and click on it to check it.