He said that his computer was down, but the text message I sent him said that I sent it successfully!

First of all, please try to trust your boyfriend:)

The customer service I just consulted, if the other party shuts down and you send him a text message, you will still be prompted that the message was sent successfully. Because your text messages are sent to the relay server, as long as your phone is not shut down, it will prompt that the message was sent successfully. Successful delivery refers to the connection between you and the relay server. So it is possible that your message shows that the message was sent successfully, but the other party did not receive the text message due to downtime. You can check whether the other party has received the information from the relay server by modifying the settings for sending reports or using some SMS software.

In addition, some customer service said that the information on the transfer server will be saved for up to 2 days. If the other party recovers quickly after shutdown, the previous information can still be received from the transfer server; but some customer service said that it is true. This is not completely guaranteed. I was down once and it was restored after a few hours. However, during those hours of downtime, I didn’t receive any text messages sent to me by 10086, so I still don’t have high hopes. If it is really down, text messages will be sent to me. Basically invisible.