(The transmission speed of GSM mobile communication network is 9.6K/s. At present, there are more than 500 million GSM mobile users in the world, covering 1/12 of the people, and the proportion of GSM technology in the field of international digital mobile phone has exceeded 70?Because GSM is relatively imitated by mobile communication technology, it is the second generation mobile communication technology, so it is called 2G for short.)
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