Computer science What is the meaning of the abbreviation GSM?  What exactly is the purpose of your smartphone's SIM card?

Enhanced Discovering Computers 2017 (Shelly Cashman Series) (MindTap Course List)
1st Edition
ISBN:9781305657458
Author:Misty E. Vermaat, Susan L. Sebok, Steven M. Freund, Mark Frydenberg, Jennifer T. Campbell
Publisher:Misty E. Vermaat, Susan L. Sebok, Steven M. Freund, Mark Frydenberg, Jennifer T. Campbell
Chapter1: Introducing Today's Technologies: Computers, Devices, And The Web
Section: Chapter Questions
Problem 3.2E
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Computer science
What is the meaning of the abbreviation GSM? 
What exactly is the purpose of your smartphone's SIM card?
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