SIM (Subscriber Identity Module)

Contents:

What is a SIM?
What is the full form of SIM?
What is the size of the SIM card?
What is the function of a SIM card?
How many Countries are currently connected with SIM?
Which material is used for making a SIM card?
How the SIM Card is Secure for making calls from different Operators?
How many Contact you can save in a SIM Card?
What are the Pros and Cons of a SIM card?

History:

In 1991, all types of SIM (Subscriber Identity Module) cards were introduced. The first SIM card is about credit card size. Since then, there have been so many updates and repetitions that they have become smaller and smaller.

This development is closely associated with the history of GSM (Global System of Mobile Communications) mobile networks. GSM developed to describe the protocols of second-generation (2G) cellular networks, today stands as the default global standard for mobile communications

What is a SIM?

The Customer Identification Module or Subscriber Identification Module (SIM), widely known as the SIM Card, is an integrated circuit intended to securely store international mobile customer identification (IMSI) numbers and associated keys. , Which is used for identification and authentication users of mobile telephony devices (such as mobile phones and computers).

It is also possible to store contact with many information on SIM cards. SIM cards (Subscriber Identity Module) are always used on GSM phones; For CDMA phones, all they need is a new LTE-capable handset. SIM cards can also be used on satellite phones, smartwatches, computers, or cameras.

SIM cards come in a variety of sizes and if you remove your SIM card from your phone, you won't be able to make calls, send messages, or connect to the Internet.

So the SIM card is just a simple memory chip that holds information to identify subscribers to a mobile network. SIM cards are often produced in the form of PVC cards with a metal part attached to the board of the mobile phone. The first SIM cards were the size of a credit card, but over time they became smaller and smaller.

There is mainly two types of SIM are:

SIM (Standard SIM)
eSIM (Electronic SIM)

What is the full form of SIM?

SIM stands for Subscriber Identity Module

What are the types of SIM Card?

There are actually 5 types of SIM cards (from largest to smallest):

Full-size SIM (FF): This is a very large, old credit card-like SIM card that fits in most phones. None of the devices sold in 2016 using such SIMs.
Mini-Sim (2F): Still, this sim type is old. It's much smaller than a full-size SIM, but it's still too big for today's standards. They are common on older basic phones and Edge / 3G smartphones. 1st generation iPhone 3 used Mini-SIM with iPhone.
Micro SIM (3F): Many manufacturers are now switching from micro SIM to nano-SIM, but some phones and tablets still use micro SIM. Micro-SIM is used in a variety of devices, 3 4G LTE GSM devices, and 4G with CDMA phones for LTE service. All iPads up to iPhone 4 and iPhone 4, as well as iPad Air / iPad mini use Micro-SIM.
Nano-SIM (4F): This is the current type of SIM card. Most devices coming up now, they are using nano-SIM. It is probably too small to be found; As you can see, the entire blue space was cut as a result of the development from SIM card to nano-SIM. The first phone to use the Nano-SIM was the iPhone 5, and all iPhones, as well as the iPods from the iPhone 5 and the use of the Nano-SIM respectively.
Embedded Sim: This is where things go. It's not in the picture I attached, but it's basically the lack of a physical SIM card. The SIM card is built into the device and acts as a subscriber module from there. Currently, there is only one embedded Subscriber Identity Module (SIM) on the device and the new 9.7-inch iPad Pro. The device also includes a mandatory nano-SIM slot, which you may need.

When and Where SIM was invented?

The first SIM card was developed by Munich's smart-card manufacturer Geiske & Deviant in 1991, which sold the first 300 SIM cards to Finnish wireless network operator Radiolinja. Today, SIM cards are ubiquitous, enabling over 7 billion devices worldwide to connect to cellular networks.

What is the size of the SIM card?

The standard SIM the card is about the size of a standard memory card, while the micro-SIM has smaller dimensions (15mm by 12mm), and finally the 12.3 by 8.8mm nanoparticle is the smallest type of traditional SIM card slot and today's advanced smartphones. They use it extensively.

What is the function of a SIM card?

In the case of mobile communication between the server and the client, the Subscriber Identity Module (SIM) can be considered as an identity. The SIM card can also be used as a location finder.
The Global Positioning System means that when a handoff occurs when the mobile does not have enough power to call, it is recorded at the nearest base station. Last but not least you can use it to save numbers or transfer numbers from one mobile to another.

How many Countries are currently connected with SIM?

SIM card is an integral part of the mobile phone to connect to the Global Mobile Communication System (GSM). In 193 countries, the global system stores information and IDs in this component.

Which material is used for making a SIM card?

The core of the SIM card is an electronic chip made of silicon, which contains some additional impurities such as phosphorus. It is coated with metals such as gold to create an outer layer that makes contact with your mobile phone. The chip is placed inside a plastic shell.

The piece is made up of several semi-conductive bonding machines and metals, all of which have been produced in four different sizes.

Basically, SIM cards are your mobile phone's ID and credit card credentials. These parts hold the necessary information inside themselves, so if they are inside any phone that is not factory locked, they will be connected to the communication network.

How the SIM Card is Secure for making calls from different Operators?

The SIM card stores a unique 20-digit identification number called ICCID, which is usually engraved on it. This is the number you need to transfer a mobile number from one operator to another.
The SIM card also stores another number called IMSI, which is essentially the same phone number. Also, each SIM card contains a list of available services for the subscriber and two security codes.

The first code is called PIN or Personal Identification Number, which you must enter after placing the SIM card in a new phone to confirm the ownership of the SIM card.
The second code, called PUK or Personal Unblocking Code, helps you unlock your SIM card if you enter the wrong PIN code more than the allowed number.

All of this information is essential for making calls and exchanging information correctly between the mobile networks of different operators.

How many Contact you can save in a SIM Card?

SIM cards (Subscriber Identity Module) also usually have memory for storing text messages and contact phone numbers that are no longer used in today's mobile phones. Standard SIM cards have between 8 and 256 KB of storage, which is enough to store more than 250 phone numbers. Of course, most people these days store, their phone numbers in cloud services instead of SIM cards.

What are the Pros and Cons of a SIM card?

Pros of SIM

Multiple accounts: The SIM card allows the user to use multiple phones with the same account. (Of course, you can use only one phone at a time).
Information Storage: The SIM card allows the user to store contact information on the chip itself. Most phones only default to storing information on the phone. You need to go to your settings (contacts of Nokia users) and copy the SIM card information.
Download Contact: This is especially useful if your phone stops working one day. You can download your contact information to your computer only by purchasing a SIM card reader (approx. Rs. 700 - 1050).

* Note- The SIM card reader does not allow you to download ringtones, wallpapers, or other items to your phone.

Cons of SIM

Multi Uses: You can only get one number per phone. You can't take advantage of your phone's multi-line capability.
User Replace: If your Subscriber Identity Module (SIM) cards are defective. They usually cost about Rs. 400-500 to replace and it does not fall under warranty. This requires visiting your local dealer.
Steal of Information: If you forget to lock your phone or SIM card, can someone with a GSM phone put your SIM card on their phone and steal your contact? Copy all over the phone? What is disqualifying from this is that if you do not hold them in the act, there is no way your information will be stolen.