What is the problem of sending a text message with a mobile phone and others saying "the text is lost" after receiving it? How to solve it?

This may be a problem with the other party's mobile phone. I've met it, too. After shutting down, reload the card and turn it on again, and you will find it.

But sometimes, because the local signal is not good, you may be in a state of no signal at the moment of receiving the information (for example, when the elevator is running), resulting in the information sent by the service provider, but you have not received it, and if you lose it, you can't get it back. The solution is to send as few words as possible or send them in several parts!