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What is the principle of sending short messages on web pages?
Web software drives SMS modem, which sends SMS to your mobile phone; Short message cat (Modem) is a network element hanging on the communication network, with ID- mobile phone number; You can send all kinds of data through it, and those spam messages and push advertisements are sent by him.
The short message cat with serial port costs 200-500 yuan, which is widely sold in the electronic market.
Support AT instruction set, that is, text command, easy to operate.
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