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It refers to additional services, which the customer use and pays for.
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There are not two SIM cards with the same information stored. It consists of an 18 – 22 digits code, which is unique for each SIM card in the world. It is a number that identifies a SIM card. If you enter the PUK code wrong more than 10 times, you will lock the SIM card without the chance of getting it back. The phone locks and asks for the PUK code that is provided by the mobile operator. This code is used when the user enters the wrong PIN code three times. The service center that stores, processes and delivers your text messages (Short Message Service). They are numbers provided by the mobile operator, which the user can use to access services such as check current balance or voicemail. It is usually made up of four digits, and can also be disabled. The mobile operator provides it but it can be changed if necessary. It is a code used to lock and unlock the mobile device. This code works as an identifier and is composed of the mobile country code (MCC), the mobile network code (MNC), and a location area code (LAC). It can be changed if the subscriber requires it. It is the phone number you need to dial to establish communication. Mobile Station Integrated Services Digital Network (MSISDN) It works as a link between the network and the user. This number identifies a subscriber from a mobile network. Mobile Subscriber Identification Number (MSIN) Together with the Mobile Network Code (MNC), identify GSM networks worldwide.
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It represents the first three digits of the IMSI number. It is a number that identifies your SIM card within your mobile network operator. International Mobile Subscriber Identity (IMSI) It consists of a 128-bit value used to authenticate the SIM card on the network. This is a GSM (Global System for Mobile Communications) service, which estimates the costs of the mobile services. Maybe it does not seem much, but it is enough to store all the information we will mention below. It can come in different capacities, from 32KB to 128K. However, there is much more inside the card. You may imagine that it stores your contact information and data about your mobile network. The truth is that this small object can contain lots of information. It is an embedded SIM, which means you do not need a physical card. However, recently some cell phones and mobile networks have introduced e-SIMs to the market. The SIM cards usually come in three different sizes, which are Standard, Micro, and Nano. Besides that, you can connect your cell phone to the internet using mobile data, which works excellent if you do not have a Wi-Fi connection. With a SIM card in your phone, you can make and receive calls, and send and receive text messages. It consists of a small chip that cell phones use to connect to a specific network. This time we will talk specifically about the information stored on a SIM card.Ī SIM card is also known as Subscriber Identity Module. Since we already know how the basic features of a cell phone work, we think it wise to have a better understanding of SIM cards. On the other hand, there is no much to do just with a SIM card, right? A cell phone without a SIM card can work properly only under a Wi-Fi connection. Two of the things that allow us to do this are cell phones and SIM cards. We communicate when we call and send messages, share photos and videos on social media, even when we send corporate e-mails. In today’s world, it is hard to imagine ourselves without communicating.