I would like to ask what does it mean when Apple sends blue messages?

Apple Send Message Blue is a service provided by Apple for iOS devices that can send messages for free through the network, that is, iMessage messages, whether using a wireless network or a mobile network. This kind of text message can only be used when both parties use iPhones, both have the iMessage service turned on, and have a network connection.

SMS, short for SMS, is text or digital information sent or received directly by users through mobile phones or other telecommunications terminals. The number of characters that users can receive and send in text messages each time is 160 English or numeric characters, or 70 Chinese characters. On April 8, 2020, China Telecom, China Mobile, and China Unicom jointly released the "5G Messaging White Paper". my country's basic SMS services have entered a comprehensive upgrade channel, and traditional SMS will be gradually replaced by 5G messaging (RCS services).

In 1992, when the world's first text message was successfully sent from a PC to a mobile phone on the GSM network of Wolfon in the UK, no one would have thought that this was originally a service provided by a telecom operator. A low-cost text message service was launched to solve the problem of high mobile phone bills. This seemingly childish communication tool has actually had such a great impact on people's economic and cultural life and even politics many years later.

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