This is how SIM cards work

We don’t think about SIM cards as much as we used to — like back when they were required to start up a phone — but these tiny chips are still essential in keeping a modern smartphone wirelessly connected at all times. This brings us to a question we should be asking: How exactly does a SIM card work?

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LTE-A Explained

A few weeks ago, I was lounging on a beach chair in Boracay Island in the Philippines, sipping on a mojito and enjoying crazy fast mobile internet speeds of about 200 megabits per second.

For the uninitiated, at 200 Mbps, you can download the original Iron Man movie in high def, or the popular racing game Need For Speed in well under 2 minutes.

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