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What is a Sim Card?

Sim Card (Subcriber Identity Module)

A sim card contains a "key" which allows devices like mobile phone access networks like O2, Vodafone, giffgaff.

Another us is it store phone number which some "older" phones use as current phones are more advance and provide more space for storing number as sims usually store about upto 100.

Sim cards come in various sizes from the first one which was credit card size (85.60 mm × 53.98 mm × 0.76 mm) and most popular now is the "normal" sim (25 mm × 15 mm x 0.76) starting to pick up trend is the "micro" sim (12 mm × 15 mm x 0.76) and rumours are now floating about a new "nano" sim but we will update about this when more information comes in.

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