How to tell yourself by SMS that you have been blacked out by the other party?

1, open the settings option in the phone. As shown in the figure below.

2. Then find the information option in the phone settings, and click. As shown in the figure below.

3. Turn on the switch to send the read receipt. As shown in the figure below.

4. When sending a text message to the specified number, if you see the message after a while, it means that the other party has not blacked you out, otherwise it will blacked you out. As shown in the figure below.