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According to which law does the mobile company turn off users' SMS function?

There is no law to turn off your SMS function.

There are several points to turn off your SMS function.

(1) you send text messages too frequently, and the mobile phone sends text messages in groups in the background by default, so it is closed. Generally speaking, after the limit is more than 200 messages per hour, the SMS function may be turned off.

2 You send someone a short message, and then someone reports you, saying that your short message contains cheating and fraud information, and then the mobile company will turn off your short message function.

Turning off your SMS function has nothing to do with the law.