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 truly works? When, and by whom it was invented? Let’s check out.

When was it invented?

First of all, have you ever ever wondered what SIM stands for? It truly means (subscriber identity module or subscriber identification module).

In 1991, The first 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 first GSM mobile phone with a SIM card; it was a Nokia 1101.

Right this moment, it’s nearly inconceivable 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. Specialists predict this number goes to grow to twenty billion within the close to future.

The European Telecommunications StandardsInstitute (ETSI) still holds the foremost SIM patents, however different private phone companies even have some essential patents because of which SIMs work.

The most important producer of SIM cards on this planet is the Gemalto company, 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 greenback each to manufacture.

In the present day, they’re basically value a few cents apiece. However 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 unique ID connects your phone number with your gadget. When someone is dialing your number, the call will go to the exact phone you might have at the moment.

SIM also 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.

If your SIM card is mobile, that means you can remove it and put it back into your phone your self, you can also use it on different phones. This comes in handy when your own gadget’s battery is dead, and also you desperately need 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, but not as a phone to make calls or text someone. For absolutely the mainity of phones, a gadget without a SIM card is like a human without a brain.

The Good news is, even in the event you severely damaged your phone — smashed your screen or bent the casing — you would 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 a good 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 while you insert the SIM in it.

It Contains the working system for the card, can do some basic math, and stores vital information. This information is placed on the chip on the production line.

The most basic types of that information are your International Mobile Subscriber Identity and a 128-bit key called Ki (Key Identification). These are basically your login and password in the mobile phone world. All messages from our phone to the network are in a categorized code.

The key to encrypt and decrypt messages is also stored on the SIM card. This provides communication privacy. The SIM card chip also stores particular data, reminiscent of your card’s unique serial number, the name of your cellular provider, your PIN (if 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 service to unblock the phone and far more. Even your contacts and final dialed numbers are there.

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