What does blue mean when Apple sends a message?

Apple message blue is a service provided by Apple for iOS devices to send messages through the network for free, that is, iMessage messages, whether using wireless networks or mobile networks. This kind of short message can only be used if both parties use iPhone, and both parties have opened iMessage service and have network connection.

Short message, short for SMS, refers to text or digital information sent or received directly 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. On April 8, 2020, China Telecom, China Mobile and China Unicom jointly issued the White Paper on 5G SMS, which made the basic SMS service in China enter a comprehensive upgrade channel, and the traditional SMS will be gradually replaced by 5G SMS (RCS service).

1992, when the world's first short message was successfully sent to a mobile phone on the GSM network in Wolfen, England, no one would have thought that this low-cost short message service, which was originally launched by telecom operators to solve the high telephone bill, would have such a huge impact on people's economic and cultural life and even politics many years later.

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