SMS alarm number 12 1 10, really? How to use it?

At present, the Ministry of Public Security of China has determined "12 1 10" as the unified public service short message alarm number of public security organs in China, and the short message alarm service of1/0 has been gradually developed in some places.

At present, 1 10 SMS alarm service has been opened in Shanghai, Tianjin, Zhejiang and other places, and it has also been opened in 44 prefecture-level cities and 15 county-level cities, and some cities are under demonstration construction. ...

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