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A subscriber identity module or subscriber identification module. You most likely use it every single day, it’s all about your SIM card, that little chip in your phone. Do you know how it truly works? When, and by whom it was invented? Let’s check out.  
  
When was it invented?  
  
To start with, have you ever wondered what SIM stands for? It actually means (subscriber identity module or subscriber identification module).  
  
In 1991, The first SIM card was developed by a German firm Giesecke & Devrient. They sold 300 SIM cards to Radiolinja, a Finnish wireless network operator. In 1992, the company sold the primary GSM mobile phone with a SIM card; it was a Nokia 1101.  
  
Right now, it’s nearly impossible to seek out an individual who’s never used a SIM card — More than 7 billion gadgets around the world use them to make calls, ship SMS, and surf the web. Experts predict this number is going to grow to 20 billion within the near future.  
  
The European Telecommunications StandardsInstitute (ETSI) still holds the foremost SIM patents, but other private phone companies even have some important patents because of which SIMs work.  
  
The biggest producer of SIM cards on the earth is the Gemalto firm, with headquarters in Amsterdam and 15,000employees. They’re now working towards the mass production of SIMs for 5G networks. First SIM cards price more than one dollar each to manufacture.  
  
At this time, they’re basically price a few cents apiece. But that worth doesn’t cover design, development, inserting chips into plastic cards, and shipping them.  
  
A SIM card has distinctive identification information on it, like what mobile network it belongs to. It’s called an IMSI -(Worldwide Mobile Subscriber Identity). This distinctive ID connects your phone number with your gadget. When somebody is dialing your number, the call will go to the precise phone you may have at the moment.  
  
SIM also has its own memory. Regardless that it’s really small — just 64 kilobytes — it can store round 250 contacts and a few SMS.  
  
By the way, the same memory was in the ApolloGuidance Computer used for the first Moon landings.  
  
In case your SIM card is mobile, that means you'll be able to remove it and put it back into your phone your self, you can too use it on totally different phones. This comes in handy when your own gadget’s battery is dead, and also you desperately need to make a phone call out of your number.  
  
Can phone work without a SIM card?  
  
Technically it can, as a camera, or a tool that connects you to Wi-Fi, but not as a phone to make calls or text someone. For the absolute majority of phones, a gadget without a SIM card is like a human without a brain.  
  
The Good news is, even when you significantly damaged your phone — smashed your screen or bent the casing — you might still use the same phone number and keep your contacts. All it takes is a SIM card transplantation.  
  
How does a SIM card work?  
  
A SIM card basically looks like a little piece of plastic. It has an even smaller chip inside that's its Microcontroller. It’s made out of silicone and plated with gold or different metals to assist it keep in touch with the phone.  
  
SIM card carries a processor, memory, and security circuits. Our mobile gadget reads the chip if you insert the SIM in it.  
  
It Accommodates the operating system for the card, can do some fundamental math, and stores vital information. This information is placed on the chip on the production line.  
  
Probably the most basic types of that information are your Worldwide Mobile Subscriber Identity and a 128-bit key called Ki (Key Identification). These are basically your login and password within the mobile phone world. All messages from our phone to the network are in a categorized code.  
  
The key to encrypt and decrypt messages can be stored on the SIM card. This provides communication privacy. The SIM card chip also stores particular data, equivalent to your card’s unique serial number, the name of your mobile provider, your PIN (in case you’ve ever wondered what it stands for, by the way, it’s your Personal Identification Number) to lock and unlock the phone, PUK code from the provider to unblock the phone and much more. Even your contacts and final dialed numbers are there.  
  
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