SIM cards are the primary component of our mobile devices. Without them, you won't be able to make any calls, send text messages, or use mobile data. Have you ever wondered how these SIM card work and how they connect to other SIM cards?
Every SIM card comes with a unique SIM card number and a serial number. But what do these numbers mean, and why are they important? Let's find out.
What Is the Job of a SIM Card?
A SIM card identifies your phone and service to the mobile network and helps you to conduct phone calls and send text messages. Without a SIM, your phone only serves as a tablet that connects to WiFi.
So, your SIM card is kind of like your phone's identity. It stores essential information like contacts.
When someone calls you, they're basically connecting to the SIM card. So, if you didn't have a SIM, there wouldn't be anything to differentiate your device from other devices when someone places a call.
What Is a SIM Card Phone Number?
Your SIM card number is also known as the ICCID. It is a globally unique serial number that identifies the SIM card itself. The Integrated Circuit Card ID (ICCID) contains 19 or 20 digits typically printed on your SIM card's backside.
Some other identifiers used for a mobile network include the IMSI and IMEI. Let's look at what the ICCID means.
What Do ICCID Numbers Mean?
The first two digits of the SIM card number are a code that identifies the telecommunications industry. These numbers help differentiate SIM card chips from other kinds of chips used, like the ones used in credit cards.
The following two or three digits represent the country. The International telephony Union (ITU) determines the individual country codes.
After that, the mobile network code (MNC) comes in. It has one to four digits of the mobile network that issued the SIM.
So, if you're using a SIM card in another country, it must connect to a local network. To do that, the MNC itself identifies with the new network. Following the MNC, the rest of the digits are the SIM's ICCID consisting of a unique number.
How to Find an ICCID Number
The ICCID number is typically printed on the SIM card or the SIM card packaging. You can also look up the SIM's ICCID number within the phone's settings. These SIM card numbers depend on the card's issued country, global region, and home network.
However, there are other identification numbers beyond the ICCID number. For instance, the International Mobile Subscriber Identity (IMSI) is used by the cellular network to identify the service plan your data plan uses.
The modem module will read the IMSI from the SIM card in the device. The IMSI identifies the network when the device needs to establish a connection.
Another identity module is the International Mobile Equipment Identity (IMEI). It's a unique number mostly printed within a device's battery component and helps to identify a device on a global IMEI database.
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