How can I see that the message has been hacked by the other party?

Want to know if the phone has been hacked by the other party?

Tools/materials: iPhone 12, ios 14.4. 1, local settings 14.4. 1.

1. Open the settings, click System Application, and select SMS.

2. Turn on the delivery report option, so that once the other party receives or rejects the SMS, it will receive a reminder.

3. Call the other party directly. Generally, the voice prompt is turned off, which is a black screen.

If you are not sure, you can also dial this number with someone else's phone. Make sure that the judgment is correct. If someone else dials successfully, it can be determined that it has been blacked out.