GSM mobile phone tool area

The full name of GSM is: Global System for Mobile Communications in Chinese, commonly known as "Global Communication". It is a digital mobile phone network standard developed in Europe. 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 Can travel around the world. The GSM system includes GSM 900: 900MHz, GSM1800: 1800MHz and GSM-1900, 1900MHz and other frequency bands.
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The full name of GSM is: Global System for Mobile Communications in Chinese, commonly known as "Global Communication". It is a digital mobile phone network standard developed in Europe. 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 Can travel around the world. The GSM system includes GSM 900: 900MHz, GSM1800: 1800MHz and GSM-1900, 1900MHz and other frequency bands.