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How Do SIM Cards Work?

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back in the good old days telephones had

physical wires linking one end to

another this was regardless of whether

or not you were making a call across the

continent or just using a couple tin

cans attached to a string whenever

you've dialed a number your phone

company could wrote your call exactly

where it needed to go using said cables

but in this brave new world of not only

phone calls but vines and snapchats and

other stuff that the kids are doing

being blasted out from cell towers

everywhere these signals have to know

where they're going every time this is

where SIM cards come in and despite the

name SIM cards isn't a new casino

building game from Maxis although that

would actually be pretty sweet sim

stands for subscriber identity module

which gives a pretty big hint as to what


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