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?

To begin with, have you ever wondered what SIM stands for? It actually 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 corporate sold the first GSM mobile phone with a SIM card; it was a Nokia 1101.

In the present day, it’s almost not possible to seek out an individual who’s by no means used a SIM card — More than 7 billion gadgets around the world use them to make calls, ship SMS, and surf the web. Consultants predict this number is going to develop to 20 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 important patents because of which SIMs work.

The largest manufacturer of SIM cards in the world 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 value more than one dollar each to manufacture.

Immediately, they’re basically worth just 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 -(Worldwide 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 exact phone you might have at 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 some SMS.

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

If your SIM card is mobile, that means you can remove it and put it back into your phone yourself, you can also use it on different phones. This is useful when your own gadget’s battery is dead, and also you desperately have to make a phone call out of 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 if you happen to severely 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 an excellent 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 contact with the phone.

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

It Accommodates 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.

Essentially the most basic types of that information are your International Mobile Subscriber Identity and a 128-bit key called Ki (Key Identification). Those 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 particular data, similar to your card’s unique serial number, the name of your cellular provider, 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 carrier to unblock the phone and far more. Even your contacts and final dialed numbers are there.

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