A subscriber identity module or subscriber identification module. You most likely use it day by day, 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?

Initially, 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 firm Giesecke & Devrient. They sold 300 SIM cards to Radiolinja, a Finnish wireless network operator. In 1992, the corporate sold the first GSM mobile phone with a SIM card; it was a Nokia 1101.

In the present day, it’s practically unattainable to find a person who’s by no means used a SIM card — More than 7 billion gadgets world wide use them to make calls, send SMS, and surf the web. Specialists predict this number goes to grow to twenty billion in the close to future.

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

The largest manufacturer 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.

Today, they’re basically value a number of cents apiece. However 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 -(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 have got on the moment.

SIM additionally has its own memory. Though it’s really small — just 64 kilobytes — it can store round 250 contacts and a few SMS.

By the way, the identical 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 yourself, you too can use it on completely 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 text 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 seriously damaged your phone — smashed your screen or bent the casing — you possibly can 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 is its Microcontroller. It’s made out of silicone and plated with gold or different metals to help it keep in touch with the phone.

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

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

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 in 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 also be stored on the SIM card. This provides communication privacy. The SIM card chip also stores specific data, akin to your card’s distinctive serial number, the name of your cellular service, your PIN (for those who’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 last dialed numbers are there.

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