When sending messages between iphone, what is the difference between sent messages and read messages? Does reading the message mean that the other party must have seen the message?

Delivery means that your message is sent smoothly, and the other party has read your message.

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1. Short Message Service (SMS for short) refers to the text or digital information directly sent or received by users through mobile phones or other telecommunication terminals. The number of characters that users can send and receive SMS at a time is 160 English or numeric characters or 70 Chinese characters.

In 2.20 14, China Mobile announced that it would create a new service entrance for users in the era of mobile internet through "unified communication". This move is interpreted by the industry as: giving up SMS and embracing unified communication. China Mobile's "New SMS" will be charged according to traffic. As part of the unified communication service planning, informed sources revealed that the service is expected to be unveiled in the middle and late February this year and is expected to be commercialized before the end of 20 15.