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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 actually 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 actually 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 this moment, it’s nearly impossible to seek out an individual who’s never used a SIM card — More than 7 billion gadgets around the globe use them to make calls, send SMS, and surf the web. Specialists predict this number goes to grow to 20 billion within the near future.

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

The most important producer of SIM cards in the world 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 value more than one greenback each to manufacture.

At present, they’re basically value a number of cents apiece. However that price 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 -(International Mobile Subscriber Identity). This unique ID connects your phone number with your gadget. When somebody is dialing your number, the call will go to the exact phone you could have at the moment.

SIM also has its own memory. Although it’s really small — just sixty four kilobytes — it can store around 250 contacts and a few SMS.

By the way, the identical memory was within 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 too can use it on totally different phones. This is useful when your own gadget’s battery is dead, and also you desperately must make a phone call from your number.

Can phone work without a SIM card?

Technically it can, as a camera, or a device that connects you to Wi-Fi, however not as a phone to make calls or textual content someone. For the absolute mainity of phones, a gadget without a SIM card is like a human without a brain.

The Good news is, even in case you critically damaged your phone — smashed your screen or bent the casing — you could 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 a fair smaller chip inside that's its Microcontroller. It’s made out of silicone and plated with gold or other metals to assist it keep involved with the phone.

SIM card carries a processor, memory, and security circuits. Our mobile device reads the chip while you insert the SIM in it.

It Incorporates the working system for the card, can do some primary math, and stores important information. This information is put on the chip on the production line.

Essentially the most fundamental 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 additionally stores particular data, akin to your card’s unique serial number, the name of your mobile carrier, 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 service to unblock the phone and far more. Even your contacts and final dialed numbers are there.

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