I want to ask how to restore the chat record deleted by SMS.

Without backup, the deleted SMS content cannot be recovered on the mobile phone, nor can it be recovered in the mobile business hall. The mobile server will not record the content of the short message, but only the time when the short message was sent.

Short message service (SMS) is a part of unified communication service plan. Users can directly send or receive text or digital information through mobile phones or other telecommunication terminals. The number of characters that users can receive and send short messages at a time is 160 English, numeric characters or 70 Chinese characters. Short message is a telecommunication service in 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.

With the extension of short messages from mobile phones to PHS and fixed terminals, and from digital mobile communication network to fixed telephone network, people's understanding of short messages is no longer just regarded as the "patent" of digital mobile phones, the business forms are changing, the network elements are changing, and the information content is gradually enriched.

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