In today’s world, it is difficult to imagine yourself without communication. We communicate by making phone calls and sending messages, sharing photos and videos on social media, and even sending corporate emails.
Two things that allow us to do this are cell phones and SIM cards. One does not help without the other. A phone without a SIM card can only work well under a Wi-Fi connection. On the other hand, there is not much you can do with the SIM card, right?
Now that we know how the basic features of mobile phones work, we think it is wise to better understand SIM cards.
In this case, we will talk directly about the information stored on the SIM card.
Table of Contents
What is a SIM card?
The SIM card is also known as the Subscriber Identity Module. Contains a small chip used by mobile phones to connect to a specific network. With the SIM card in your phone, you can make and receive calls, and send and receive messages. Alternatively, you can connect your cell phone to the internet using mobile data, which works best if you do not have a Wi-Fi connection.
SIM cards usually come in three different sizes, namely Standard, Micro, and Nano. Recently, however, some cell phones and cellular networks have introduced SIM cards in the market. It is an embedded SIM, which means you do not need a portable card.
How to get a forgotten SIM card number?
It is very common when you forget your old sim card number of any mobile network like Jazz, Ufone, or Zong and don’t know about it. So now, you can find your forgotten mobile SIM numbers easily by how to check zong number or what is the zong number check code?
The fact is, this little thing can be very informative. You may think it stores your contact information and data about your mobile network. However, there is much more inside the card. It comes with a variety of capabilities, ranging from 32KB to 128K. It may not seem like much, but it is enough to keep all the information down below.
Information Saved on SIM Card
Advice of Charge (AoC):
This is a GSM (Global System for Mobile Communications) service, which estimates the cost of mobile services.
Authentication Key (Ki)
It is different for each SIM. Contains the 128-bit value used to authenticate the SIM card in the network.
International Mobile Subscriber Identity (IMSI)
It is a number that identifies your SIM card to your mobile network operator.
Mobile Country Code (MCC)
Represents the first three digits of the IMSI number. Along with Mobile Network Code (MNC), identify GSM networks worldwide.
Mobile Subscriber Identification Number (MSIN)
This number identifies the subscriber to the mobile network. It acts as a link between the network and the user.
Mobile Station Integrated Services Digital Network (MSISDN)
It is the phone number you need to call to get a connection. It can be changed if the subscriber needs it.
Local Area Identity (LAI)
This code serves as an identifier and contains the country code (MCC), mobile network code (MNC), and area code (LAC).
Personal Identification Number (PIN)
It is a code used to lock and unlock a mobile device. The mobile operator offers it but can be changed if necessary. It is usually composed of four digits, and may no longer work.
Service Dialing Number (SDN)
The numbers provided by the mobile operator, the user can use to access services such as checking the current balance or voicemail.
Service Provider Name (SPN)
Name of your mobile operator.
Short Message Service Center (SMSC)
Service center that stores, processes and delivers your text messages (Short message service).
Unblocking Code (PUK)
This code is used when a user enters the wrong PIN code three times. The phone locks and asks for the PUK code provided by the mobile operator. If you enter the PUK code incorrectly more than 10 times, you will lock the SIM card without the possibility of retrieving it.
Integrated Circuit Card ID (ICCID)
It is a number that identifies the SIM card. Contains an 18 – 22 digit code, which differs from each SIM card in the world. No two SIM cards with the same information are stored.
Value-added Services (VAS)
Refers to additional, customer-paid and paid services.
