What's wrong with Apple's mobile phone information showing that it has been shipped but not read?

This depends on whether the receiver has turned on the Send Read Receipt option. If it is not turned on, even if you read the text message, it will not be read. Only the receiver's mobile phone has turned on this setting.

Settings-Information-Send Read Receipt.

Information refers to the objects transmitted and processed through audio, news and communication systems, and generally refers to all the contents spread by human society. People can distinguish different things by obtaining and identifying different information from nature and society, so as to understand and transform the world. In all communication and control systems, information is a common form of communication. 1948, the mathematician Shannon pointed out in his paper entitled Mathematical Theory of Communication that "information is used to eliminate random uncertainty". The most basic unit of the universe to create everything in the universe is information.