A subscriber identity module or subscriber identification module. You most likely use it daily, it’s all about your SIM card, that little chip in your phone. Do you know how it really works? When, and by whom it was invented? Let’s check out.  
  
When was it invented?  
  
To start with, have you ever ever wondered what SIM stands for? It truly means (subscriber identity module or subscriber identification module).  
  
In 1991, The primary SIM card was developed by a German company 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 not possible to find an individual who’s never used a SIM card — More than 7 billion gadgets all over the world use them to make calls, send SMS, and surf the web. Experts predict this number is going to grow to twenty billion in the close to future.  
  
The European Telecommunications StandardsInstitute (ETSI) still holds the foremost SIM patents, but other private phone companies even have some vital 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 every to manufacture.  
  
At present, they’re basically worth a couple of cents apiece. But that worth doesn’t cover design, development, inserting chips into plastic cards, and shipping them.  
  
A SIM card has unique identification information on it, like what mobile network it belongs to. It’s called an IMSI -(International Mobile Subscriber Identity). This distinctive ID connects your phone number with your gadget. When someone is dialing your number, the call will go to the precise phone you've at the moment.  
  
SIM additionally has its own memory. Despite the fact that it’s really small — just sixty four 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 primary Moon landings.  
  
In case your SIM card is mobile, that means you may remove it and put it back into your phone your self, you can also use it on totally different phones. This comes in handy when your own gadget’s battery is dead, and also you desperately have to make a phone call from your number.  
  
Can phone work without a SIM card?  
  
Technically it can, as a camera, or a tool that connects you to Wi-Fi, however not as a phone to make calls or textual content someone. For absolutely the majority of phones, a gadget without a SIM card is like a human without a brain.  
  
The Good news is, even in the event you critically damaged your phone — smashed your screen or bent the casing — you may still use the identical 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 is its Microcontroller. It’s made out of silicone and plated with gold or different metals to help it keep involved with the phone.  
  
SIM card carries a processor, memory, and security circuits. Our mobile machine reads the chip whenever you insert the SIM in it.  
  
It Contains the operating system for the card, can do some fundamental math, and stores essential information. This information is placed on the chip on the production line.  
  
Essentially the most basic types of that information are your Worldwide Mobile Subscriber Identity and a 128-bit key called Ki (Key Identification). Those are basically your login and password within the mobile phone world. All messages from our phone to the network are in a labeled code.  
  
The key to encrypt and decrypt messages can be stored on the SIM card. This provides communication privacy. The SIM card chip additionally stores specific data, such as your card’s unique serial number, the name of your cellular service, your PIN (should 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 carrier to unblock the phone and far more. Even your contacts and last dialed numbers are there.  
  
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