What happens if the message is not displayed after it is sent?

The message sent does not show that it has been delivered, which may be due to the following reasons: the network signal is unstable or the network connection is not smooth, resulting in the failure to send the message in time and get feedback. The other party's mobile phone is turned off or not in the service area, resulting in information not being transmitted to the other party's mobile phone and no feedback.

It was not sent successfully. When the mobile phone network signal is not good, sending information fails and "delivered" will not be displayed. During this period, the mobile phone is not in the service area, there is no signal, and you can't send text messages.

If you send enhanced information, the other party can't receive it. Maybe your message or number may be controlled by the operator's security policy, and the operator did not send it to the receiving end after receiving the message. For details, please call the operator customer service to confirm the cause of the problem. If it still hasn't been solved, I suggest you consult the operator.