What is iMessage? What's the difference between SMS and SMS? Is there a charge for using it?

IMessage is an instant messaging software launched by Apple, which is free to use. The differences with SMS are as follows:

First, the subject is different.

1, iMessage: It is an instant messaging software launched by Apple.

2. SMS: Text or digital information directly sent or received by users through mobile phones or other telecommunication terminals.

Second, the characteristics are different.

1, iMessage: You can send short messages, videos, etc. It has high security.

2. SMS: The number of characters that users can receive and send SMS at a time is 160 English or numeric characters or 70 Chinese characters.

Third, the advantages are different.

1, iMessage: Different from the SMS/MMS service of operators, users only need the data support of WiFi or cellular data network to complete communication.

2. SMS: It is a kind of telecommunication service accompanying digital mobile communication system. It is a non-real-time and non-voice data communication service to transmit text or digital short messages through the signaling channel and signaling network of mobile communication system.

Baidu encyclopedia -iMessage

Baidu Encyclopedia-SMS