SIM Card

Working and types of SIM card

SIM card is a smart card used to make communication between the users. It is a convenient memory card utilized basically as a part of phones that work universally for communication. The SIM cards hold the individual information of the record holder including his or her telephone number, location book, instant messages and its related information. A SIM circuit is installed into a removable plastic card. This plastic card is known as a "SIM card" and can be exchanged between distinctive mobile gadgets. The advancement of physically mini mobile gadgets causes the improvement of mini SIM cards where the amount of card encompassing the integrated circuit is decreased.

Internationally each SIM cards are identified by ICC-ID, which means Integrated Circuit Card ID. During personalization process this ICC-ID is stored or printed on the SIM cards. This ID contains 18 digit numbers along with single check digit for error detection. This digit was calculated using Luhn Algorithm. It helps to detect mistyped digit or error in input digits. These 18 digits are further classified into three types. First one is a group of 7 digits which contains major industry identifier, Country code, Issuer Identifier number. Rest of number represents Individual account identification number, then the last digit is checksum digit. Let us consider 81 91 23 1311 00 143547 0 be the 18 digit ID. From this number,

First two digits (81) – represents major industry identifier

Next two digits (91) - Country code

Next two digits (23) – Issuer identifier number

Next four digits (1311) – month and year of manufacturing

Next two digits (00) – Switch configuration code

Next six digits (143547) – SIM number


A SIM card offers security for both the client's information and his or her calls. The cards can be bolted implying that just somebody who has the right individual identification number (PIN) can utilize the card. On the off chance that the telephone is stolen, the criminal can't utilize a bolted SIM or get any information off of it without the PIN.  

Further, the card has a mystery confirmation code and an encryption scratch that ensures the telephone's transmissions. Despite the fact that it is conceivable to "clone" a cell on the Global System for Mobile Communications network and in this way take services. It’s substantially more troublesome than it is to clone a telephone on the contending Code Division Multiple Access network. In view of the way the encryption information is transmitted to the bearer. It’s typically important to have physical access to the SIM card with a specific end goal to duplicate it. For any investigation, the investigator can collect some details like incoming/outgoing call details, SIM contact, SMS details etc. from SIM card. Some soft wares are also available now for recovering information from SIM cards.

Types of SIM cards

There are a couple of diverse SIM cards we have accessible. The working of all SIMs is same but one difference that they come in different shapes. Your phone's intended to take one specific shape SIM, so verify you've pickup the privilege one for your cell phone or Smartphone. Here are a few illustrations:

Standard SIM card

It is the largest in size among all the available SIM cards. Standard SIM card are widely used in these days in the cell phones and tablets. The size of standard SIM card is 2.5 centimeters long and 1.5 centimeters broad.

Micro SIM cards

The micro-SIM was intended for retrogressive similarity. The real issue for regressive similarity was the connection range of the memory. Holding the parallel connection zone permits the micro-SIM to be perfect with the earlier, bigger SIM peruses through the utilization of plastic set pattern encompasses. 


Nano SIM cards

The 0.67 mm thickness of the NANO SIM is around 12% not exactly the 0.76 mm of its forerunner. 4ff can be put into connectors for utilization with gadgets taking 2ff or 3ff Sims; numerous telephone organizations however don't suggest utilizing these adapters. The iphone 5 discharged in September 2012, was the first gadget to utilize a Nano-SIM card emulated by different handsets including the Nexus. It is newly come in the market used in the smartphones.

Other than the conspicuous focal point of being littler there isn't essentially preference to utilizing a littler SIM card.

Working of SIM card

The stored datas in SIM cards are ICC ID, IMSI (International Mobile Subscriber Identity), Information about the network, Security Authentication Information, PIN (Personal Identification Number), PUK Code, Users information and GSM/CDMS identity. Each SIM card has an internal data storage system. If you start up the one more of a cell phone that is outfitted with an SIM card, you will see the card fold into the cell phone. Typically, the card is fold behind the battery. SIM cards are furthermore incredible on the grounds that they can be utilized with any handset that supports them. For instance, whenever your cell phone failure and you are not able to do calls from it, yet at the same time have a dynamic SIM card, you are in luckiness. Simply get your SIM card from the cell phone and fitting it into another cell phone and start communication with a new phone using same SIM card. SIM cards are encoded with data regarding the transporter that you are utilizing and additionally data like your location book. And hold data similar this on an SIM card will permit you to make a quick and straightforward switch over to an alternate telephone on the same transporter, or to switch transporters totally.

On a few networks the cellular telephone is bolted to its SIM card for example, on the GSM networks in the USA. This has a tendency to happen just in countries where cell telephones are intensely sponsored, however that being said not all countries and not all operators. For example and in the UK regularly most telephones with appropriations are not SIM bolted. In countries where the telephones are not sponsored, for example, Italy and Belgium, all telephones are opened. Where the telephone is not bolted to its SIM card, the clients can undoubtedly switch networks by essentially supplanting the SIM card of one network with that of an alternate while utilizing one and only telephone. This is normal for instance among youthful clients who may need to improve their telecoms activity by distinctive levies to diverse companions on distinctive networks. It is known as the "SIM card switch".

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