Is spam delivery hacked by the other party?

System: IOS 15.4

Sending a text message means that the message has been sent, but it does not mean that the other party has not blacked you out. If it is WeChat, it can be said that you have not been blacked out. The sending of the SMS shows that it has been delivered, and it also shows that the other party has received the SMS, which means that the other party has received the SMS and has not been blacklisted.

Take iPhone 13 pro as an example, enter Apple's mobile phone settings and open the "Information" setting interface. In the information settings, it will be blacked out by lighting "Filter Unknown Senders". Cancel the "send information filtering receipt", the message can be sent but has been blacked out.

Simply relying on SMS does not confirm that the other party has blacklisted you. To confirm whether the other party blacklists you, you can use the following methods:

1. You can try dialing the other party's number with your mobile phone. Generally, you will hear "The number you dialed is power off", "The number you dialed is busy" and "The number you dialed does not exist". If you dial regularly for many times, you will always hear such a prompt tone, indicating that the other party may have pulled you into the blacklist.

2. There is another number that you can dial, but you can't dial it yourself. You can be sure that the other party will pull you into the blacklist.