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

When was it invented?

First of all, have you 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 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.

At the moment, it’s practically unattainable to seek out a person who’s by no means used a SIM card — More than 7 billion gadgets around the world use them to make calls, send SMS, and surf the web. Specialists predict this number is going to develop to twenty billion in the close to future.

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

The biggest 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 dollar every to manufacture.

As we speak, they’re basically value a few cents apiece. However that value 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 distinctive ID connects your phone number with your gadget. When somebody is dialing your number, the call will go to the precise phone you will have on the moment.

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

By the way, the same memory was in the ApolloGuidance Computer used for the first Moon landings.

If your SIM card is mobile, which means you possibly can remove it and put it back into your phone yourself, you may as well 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 device that connects you to Wi-Fi, however 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 in the event you significantly damaged your phone — smashed your screen or bent the casing — you could 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 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 in touch with the phone.

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

It Incorporates the operating system for the card, can do some fundamental math, and stores important information. This information is placed on the chip on the production line.

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 (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 carrier to unblock the phone and far more. Even your contacts and final dialed numbers are there.

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