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How SIM Cards Actually Work

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What SIM does stand for? It means subscriber identity module or subscriber identification module. The first SIM card in the world was developed in 1991 by the German company Giesecke & Devrient. They sold 300 SIM cards to Radiolinja, a Finnish wireless network operator. In 1992, they sold the first GSM mobile phone with a SIM card; it was a Nokia 1101. Today, it’s hard to find a person who’s never used a SIM card – over 7 billion gadgets around the world use them to make calls, send SMS and surf the web.

Why do I need a SIM card?
Can my phone work without a SIM card?
How does a SIM card work?
Can someone track my location with the help of a SIM card?
Do SIM cards break?
Why are SIM cards getting smaller?
The future of SIM cards

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posted by Kramekgg