Joke Collection Website - Blessing messages - How does Unicom know if the other party has received the text message?

How does Unicom know if the other party has received the text message?

In the SMS settings, just open the status report! (I don't know if your mobile phone has this function) Send a text message later. If you receive "delivered" immediately, it means that the other party has received it. If the status is "sending suspended", it means that the other party did not receive it! (Nokia's mobile phone is like this! )