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How do mobile sim card work's??

   Mobile sim cards.



Sim card stands for subscriber identify module .the SIM card is developed in the year 1991 by the German company Gieseke and deverient they sold 300 sim cards to radiolinea . Which is wireless network operator in 1992..they sold first GSM Mobile phone with a sim card it was nokia 1101 ..
Today it is hard to find a person who's never used a sim card ..there are over 7billion gadget's around the world use them to make calls, messages and web surfing ..experts predict this number is going to grow 20 billions ...



The largest SIM card manufacturing company is gemalto..with headquarters in Amsterdam and 1500 employees they're now working towards the mass production of SIM cards for 5G network ...the first sim card costs more then 1$ for each ..but Today then cost is very much reduced..a SIM card has unique identification information on it..
This unique I'd connect your phone number with your gadget's ..when some one dilling your number the call will go exacte phone you have .. SIM  also have it's own memory even through it's small just 64 kB ( kilo byts ) it can even store around 250 contacts and some SMS ...



The same memory was used in Apollo guidence computer used for first moon landing ...
How does a SIM card work .



Basically looks like a little piece of plastic it has even smaller chip inside of that is it's microcontroller made up of silicon and plated with gold or other materials which helps in contact with the phone ...the chip contains a processor , memory and security circuit ...your mobile device reads the chip information when you stick the sim in it...the most important information put on chip during the production ...they are
Your international mobile subscriber Identity ..and a 128 bit key for key identification Those are basically your phone login and posword ,messages from your phone to network are in secret code ..the secret code encrypt and decrypt the messages  those messages stores in SIM card this provids communication privacy ...and also store unique serial number of your card ,the name of your mobile operator and your pin(personal identification number) to unlock the phone puk code from Carrier to unblock the phone and much more...even your contacts and cast diled numbers ,trace location using your phone,example like find your phone service in your mobile ...
Why are sim cards getting smaller ..



The first sim card were around the same size and shape of the credit card ..they work fine with the first mobile phone ,but mobile technology evolved and getting smaller ..the SIM card need improvement too. imagine fitting a credit card into your phone ..not the best idea right!!.. fortunately Sims became  smaller and more powerful at the same time ,first came standard thumbnail size Sims they were standard until 2010 ..when micro sim become universal,even that sim have too much plastic ...in 2012 nano Sims came into play ,which are in assence they just little chips with no extra plastic around them.



The future of SIM cards will be E-sims embedded sim cards their size will be just a fraction of a nano chip..that means no Physical SIM cards ..the information on the chip will be rewritable so you'll be able to change ,your carrier with few easy steps ,E-sims will be cloud based ,super fast,super secure  with convient ... Low installation cost and Better design with more physical space on your gadget's...you will get extra protection from water and dust getting inside .. iPhone have already two Sims cards one is Physical and other is an e-sim that you can use with any other carrier.

Thanku for reading this article I hope you like this article....


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