The full name of GSM is: Global System for Mobile Communications, and the Chinese is "Global System for Mobile Communications"
It is the second generation of mobile communication technology, and its development purpose is to allow all parts of the world to use a mobile phone network standard, allowing users to use a mobile phone to travel all over the world.
China Mobile Communications Corporation（CMCC） and China Unicom each have a GSM network, which is the world's largest mobile communication network.
The GSM system includes frequency bands such as GSM 900: 900MHz, GSM1800: 1800MHz, and GSM-1900: 1900MHz.
It is the second generation of mobile communication technology, and its development purpose is to allow all parts of the world to use a mobile phone network standard, allowing users to use a mobile phone to travel all over the world.
China Mobile Communications Corporation（CMCC） and China Unicom each have a GSM network, which is the world's largest mobile communication network.
The GSM system includes frequency bands such as GSM 900: 900MHz, GSM1800: 1800MHz, and GSM-1900: 1900MHz.