Saturday, August 8, 2009

What is a Sim Card of a mobile phone?

SIM card is the card which contains the specific information of the user who use a GSM mobile. This card contains information that is used for billing purposes. Simply put, it is like an identity card for the user who uses a GSM mobile. SIM is the short form of Subscriber Identity Module and you can easily understand its function by reading its name.

The main function of a SIM card is to store information of different users . However, there are lots of benefits that are associated with SIM card and the best one is about the portability as you can easily use another mobile by changing the SIM card. So, the things are really getting even convenient with the introduction of SIM card. However, it is essential to mention that SIM card is not just a portable memory chip as it is an amazing piece of technology that can easily amaze anyone.

A SIM card is just like a hard disk in a computer. Like a hard disk, it also keeps specific data like messages, phone book and other such like information can also be found in SIM card. Also, it stores the International Mobile Subscriber Identity or simply service-subscriber key which is essential to recognize a subscriber. IMSI is used to recognize a user on their individual operator network, whereas, Integrated Circuit Card ID is used to recognize each SIM internationally.