Apple 1 1 hacked each other. The message I sent him didn't show delivery.

Take iPhone 1 1 of IOS 14 system as an example. When the text message was sent, the prompt from Apple's mobile phone had not been delivered. It may not be blacked out by the other party, or it may be that the other party's mobile phone has no signal for the time being, or it is turned off, or the other party has started the flight mode.

When the other party's mobile phone has a signal, or turns it on or turns off the flight mode, the other party receives the message, and the user who sends the message will receive the notice that the other party has received it.

If every time you send a message to the other party, you are reminded that it has not been delivered, and there is no notice received by the other party, it is very likely that it will be blacked out by the other party.

Moreover, when the user sends a message, there will be a prompt that has not been delivered or has been received by the other party, mainly because the user has turned on the information feedback function of the mobile phone, and can choose to turn it off if it is not needed.

Specifically, just turn on the phone, find the setting options from the phone desktop, and turn it on. After entering the system settings page, click the open information option to see the information feedback function. Just turn off the switch in the back.