The SIM (Subscriber Identity Module) card is what drives your mobile phone and is your phone’s distinct identity. So it is only natural to learn more about how the ubiquitous SIM card works. The SIM card is more than meets the eye. Within such a small form factor it would not be wrong to say that the SIM packs quite a punch. With each passing day the SIM cards are getting smaller but ironically are getting more powerful thanks to improved technology and the need to drive more powerful smartphone devices.
You can look at a SIM card as a sort of smart card for phones that can help to connect, communicate and link with the server. Every SIM card has an IMSI (International Mobile Subscriber Identity) number that helps to recognize and validate any mobile phone worldwide. It’s a unique identity of your SIM and no two SIMs can have the same IMSI number.
Some of the details associated with a SIM card are:
- Integrated circuit card identifier
- Security authentication information
- Personal Identification Number
- Supplemental Security Income (SSI)
- Temporary information about the network
- Personal Unblocking code
Modern day SIM cards also contain an internal memory that can help store vital information which could include personal contacts, SMS messages, and so on. The SIM has evolved consistently since its first usage in 1991. SIM cards let you store your personal identity data that is used to connect seamlessly to a wireless network of choice for the subscriber.
Today’s SIM cards let you run SIM-based applications that can range from a whole host of services like lock for SMS, direct accessibility to social media channels, activation of roaming facilities and so on.
The SIM cards are based on the network that you utilize to stay connected with the rest of the world. The networks are strictly segregated based on the technology that is used to access the network. Some common technology platforms are – CDMA (Code Division Multiple Access), GSM (Global System for Mobile Communications), UMTS (Universal Mobile Telecommunications System), LTE (Long Term Evolution) and so on. There could be other types of SIMs that are used for some specific applications and newer emerging technologies.
Thus a SIM card could be seen as a key to unlocking the full potential of your mobile phone. It lets you enjoy the various benefits accorded by the mobile network be it voice, text, or data.