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What do you mean by free SMS?

Brand model: Redmibook Pro 15

System: Windows 10

Free network short message means: Free network short message is a text message transmitted through No.7 signaling network, the size of its information content is limited to about 70 words (140 bytes), and messages can be sent to each other for free. Free network short messages are mainly sent and received by mobile phones and between mobile phones and the Internet. Network short message refers to the information transmission process from the mobile phone terminal to the Internet or from the Internet to the mobile phone terminal when users receive or send short messages through the Internet.