What is a SIM card and what does it do?
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What exactly is a SIM card? Here
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What is a Sim Card - What Does a Sim Card Do
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SIM Cards Explained (Simply)
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![](https://upload.wikimedia.org/wikipedia/commons/3/3c/SIM-Karte_von_Telef%C3%B3nica_O2_Europe_-_Standard_und_Micro.jpg)
SIM card - Wikipedia
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What Does a SIM Card Do and Why Do You Need One? - TheStreet