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  2. GSM - Wikipedia

    en.wikipedia.org/wiki/GSM

    The second mobile provider to shut down its GSM network (on 1 January 2017) was AT&T Mobility from the United States. Optus in Australia completed the shut down of its 2G GSM network on 1 August 2017, part of the Optus GSM network covering Western Australia and the Northern Territory had earlier in the year been shut down in April 2017. [17]