How Sim card works? We all have one or two SIM cards installed in our smartphones. Many people are also using e-SIM cards today. Today in this article we will tell you what a SIM card is and how it works. SIM means Subscriber Identification Module. This is a kind of chip which is inserted inside our mobile. With the help of SIM card, a subscriber is identified under a network. Every subscriber using a SIM card is identified by a unique number called International Mobile Subscriber Identity IMSI number, which provides information about location and data.

To connect any smartphone to the cellular network, it is necessary to have a SIM card. A connection between the two is established through a unique authentication key (a type of data) which customers have to unlock when they get a new SIM. Every SIM card contains this data and it is designed in such a way that the user cannot access it through the mobile phone.

There is a lot of information inside the SIM card

The SIM card not only connects the mobile to the cellular network but also contains many types of information inside it, such as it contains information about its own integrated circuit card. Similarly, information about IMSI number, location area of ​​the subscriber, as well as his current location. Apart from this, information about which people the SIM card user can connect to while roaming on the network, which emergency numbers he can access and how much space is available in the SIM card, all this is available inside the SIM card. Besides, the user’s contact and SMS information is also inside a SIM card.

How does a SIM card work?

SIM cards are prepared by ISO/IEC 7816 i.e. the International Organization for Standardization and the International Electrotechnical Commission. This standard applies to other electronic items including smart cards. This standard consists of an integrated circuit inside the card which is glued onto a silicon substrate. On the other side there are metal contacts which are responsible for the gold color of the SIM card. That means the color we see from above is the metal contacts only. Through wires, the integrated circuit is connected to the metal contact and then it is connected to the data connector of the smartphone.

SIM card has small segments

When you look at the SIM card, it has different small segments. A small segment is called a pin and each segment has a specific purpose, such as Pin 1 collects the operating voltage that powers it to operate. The function of Pin 3 is to access the SIM clock while Pin 5 is responsible for grounding. Similarly, Pin 7 transmits data. The PIN roles assigned to SIM cards are determined by the ISO/IEC 7816-2 standard.

Talking about the network side of the SIM card, it helps in connecting a phone to the cellular network. When a subscriber dials another person’s number, the smartphone sends the data (authentication key) through the network to the telephone exchange. If the receiver is also connected to this exchange (same operator) then the network between the two is established and the call is routed to the receiver. If the receiver is connected to another exchange, a computer connected to the network helps route the call.

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