What is sim card | SIM full form

SIM card is included in the list of some of the top things in the world because whether it is to make a call or use the internet, the SIM card is necessary. So almost 99 percent people are familiar with the SIM name. Then whether they have deep knowledge about the SIM card or not, that is a different matter.

But probably even 10 percent people would not know that the full form of SIM is not known, so if you also do not know that the full form of SIM is not known. So don’t worry here you will get the information.

What is a SIM Card

The full form of SIM is Subscriber Identity Module OR Subscriber Identification Module . The SIM card is a subscriber module. Which is used by telecom companies for customer identification. The SIM card keeps the key and data provided by the telecom company safe. Which authenticates the id of the subscriber and a number is provided to all SIM cards for authenticity.

Which we know by the name of mobile number, the phone in which the SIM card is inserted. That SIM card can collect a lot of information about that phone.

Which telecom companies can see very easily, because that SIM card is prepared by them only.

SIM cards are mainly used for customer identification and subscription. And you can subscribe to the services of the company provided on that SIM card, for which you will have to pay a charge. The charges of all the companies may be different.

By the way, vertual identification can also happen but internet connection is also required for vertual subscription and identification. And you cannot access internet without sim card. Because that telecom company only provides you internet, whose sim card you use.

So therefore if you want you can use virtual subscription identity for some temporary tasks. But remember it will only be temporary.

If you want, you can search by typing “virtual mobile number” on the internet. You will find many virtual mobile number providers.

when and who invented the sim

The world’s first SIM card was invented by Giesecke & Devrient in 1991 but at that time two types of SIM cards were introduced. The size of one was very big, of the size of a credit card and the other was in small size.

And the first 300 SIM cards were sold to a Finnish wireless network operator. Whose name is Radiolinja. Since SIM cards were recently developed at that time, the capacity of SIM cards at that time was very less. In that you could save very few contacts and could store very few messages.

But never mind, SIM card was invented at that time, this is a big deal, because nothing gets better at the time of invention. Rather, improvements are made in it gradually and after some time they become much better.

And the same happened with the SIM card, continuous improvements were made in the SIM card. So that you can see how advanced the SIM cards of this time are.

sim card size

And as far as the size of the SIM card is concerned, you can see its size yourself, first time it was of the size of a credit/debit card. And today you will get the smallest SIM in nano size. In most of the phones of this time, only the option of nano SIM card is available.

First time credit card size, and more recently Mini (standard size) SIM card. After that, ever since the trend of android phone came, the size of the SIM card was reduced twice in a row.

Because many android phone manufacturer companies have started giving micro SIM card slot in their phones. However, in the initial phase, many companies used to provide standard size SIM card slot. But gradually all companies adopted the option of micro sim card slot.

And at the same time, many companies have made the SIM card slot of their phone nano. At this time, you will find only nano SIM card slot in most of the phones. And in some phones nano + Micro, now the standard SIM card slot is being completely removed from the newly made phone.

What is esim

By the way, now the option of ESim is also available, so that you will not need to insert SIM card from outside. But maybe it is not that effective, and people might not like phones with eSIM.

Embedded Subscriber Identity Module

The full form of eSIM is also the same, just embedded has been added to it. Because eSIM is already installed in phones.

Yes, eSIM is already installed in phones but no mobile number is registered on it. On this mobile number is registered after purchasing the phone.

And if you want my opinion about eSIM. So all I would like to say is that I do not like eSIM card at all. Because if we use eSIM card phone then we can neither remove the SIM card. Nor can any other SIM card be inserted in it.

And everyone often needs to remove the SIM card or insert another SIM card. That’s why probably the demand for eSIM will never increase, and only normal SIM cards will remain in demand.

Changes in the SIM card slot of the phone

At one time we had to open the phone to insert the SIM card and remove its battery. Only then we could insert the SIM card, but now SIM card slots are available on the side of the phones. Which requires a pin to open and then we can insert the SIM card in it.

What is the use of SIM

You know very well that today the whole world is connected to each other through internet. Today most of the work is being done through internet only, mostly such work is there. Which people do from home through internet.

Today the internet is capable of meeting almost all kinds of needs. And all this has become possible because of this. Because every person is able to access the internet, in which the main role is that of the SIM card.

Telecom companies provide internet to you through SIM card, for which you have to pay the charge. If you want deep information about internet then read this article, internet

But remember that the internet did not start after the invention of the SIM card. Rather, the internet started long before the invention of the SIM card. But not everyone could access internet connection in that condition. Because at that time there was no special equipment for internet connection.

But along with the invention of SIM card, there were many other technical inventions which changed the world of communication.

The SIM card was invented in 1991, and in 1989 Tim Berners-Lee invented the www. The invention of http in 1991 and the invention of html, computer programming language, in 1993. All these three were invented by Tim Berners-Lee.

Due to which there was a very fast revolution in the internet world, because after the invention of www, it became possible to create a public website. However, all the contribution in this was from Tim Berners-Lee. Because SIM card and internet are completely different, just they were communicated together so that whole world can access internet.

Because as far as accessing the internet is concerned, you can access the internet even without a SIM card. But if you want to use the internet without a SIM card, then it might cost you dearly.

Because for that you will have to take separate equipment. Like broadband and then you can access internet through boradband. But if internet service was not available on the SIM card, then probably there would not have been as many internet users as there are at this time.

registered mobile number for all sim cards

You cannot imagine how many active SIM cards will be there in the whole world. Because almost everyone uses mobile. And many people use multiple sim cards.

A number is provided by the Telecom company for each SIM card, which we know by the name of mobile number. And one number cannot have two sim cards, because if it were so, there would be a lot of problem in identification. But suppose if something like this had happened then maybe the code would have been done at state level or district level instead of country wise. And codes would have been compulsory for all calling.

But there is nothing like that because there are country level codes for a mobile calling. Like +91 for India, China +86, Germany +49 etc.


This is the best facility of SIM card because if you are not liking the services of that SIM card. Or if there is a network problem, then you can buy a SIM card from another company. Or if you want, you can port the same SIM card to another company.

Porting is better than taking another new number. Because this does not change your mobile number, only yours.

Telecom company can track the activity done by SIM card?

By the way, the sim card of the company you use through which you make calls. It is called telecom company. But if that company also provides you internet service, then you can also call it isp. Because he is providing you internet service. isp, then you would know that the telecom company has complete data of your calls and messages.

Even the telecom company can track you easily, it can find out which phone you are using. And if you are using internet then that isp means the company whose sim card you are using.  Through which you are using the internet, it can easily track what you have used on the internet.

But if you want, you can turn off tracking by using vpn, your isp will not be able to track you if you use internet through vpn. And you will also be able to use those programs which are blocked in your country.

How many types of sim cards are there

What is prepaid sim

Prepaid sim cards are such sim cards that you have to recharge first, after that you can use it. Almost everyone uses prepaid SIM card only. That is, prepaid SIM card is like debit card. The more recharge you have in your SIM card, the more you will be able to use it.

What is Postpaid SIM

In Postpaid SIM card, you have to pay after using it. That is, first use it like a credit card and then pay its bill after that.

Like prepaid, you will get many plans in postpaid as well. And you will not have to pay when the plan is activated and you will have to pay at the end of the plan.

In this article you learned what is SIM and SIM full form. We hope this information will prove useful for you.