| Mobile phones have today become a necessity | | | | is that it carries with itself an intrinsic |
| of modern day living. It is the most popular | | | | telephone number. The user, who puts a |
| and easy way of remaining connected all the | | | | particular SIM in his mobile phone, becomes |
| time with your family, relatives, friends, | | | | the owner of that particular mobile phone |
| business associates, clients and customers, | | | | number. If a SIM is taken from one instrument |
| irrespective of distance. Whether it is in | | | | and put in another, then the second phone |
| the same city or on foreign shores, the | | | | carries the number. Similarly, if a new SIM |
| mobile phone, being portable, can be carried | | | | is put in the first phone, then that |
| anywhere and everywhere. But, without the SIM | | | | instrument answers to the call of the number |
| card, this instrument is absolutely useless. | | | | carried in the new SIM. |
| | | | |
| The SIM (Subscriber Identity Module) card is | | | | The memory of a SIM card varies. Major |
| very small, even smaller than a thumb | | | | Service providers like O2, Vodafone, Orange |
| impression, but without it your mobile phone | | | | and T-Mobile have now started providing |
| is a worthless and useless piece of plastic. | | | | exciting features and bill plans in order to |
| The card is a data bank for the mobile phone | | | | attract more and more customers. All mobile |
| and without it the user cannot make or | | | | companies majorly offer two kinds of |
| receive calls, send or receive messages | | | | services: prepaid and post paid. Even |
| listen to music and click photos. It would | | | | consumers can now change their number, their |
| not be incorrect if we compare the SIM of a | | | | service provider and the billing plan at the |
| mobile phone to the CPU of a computer. It is | | | | drop of a hat. |
| like the brain and the heart of the mobile | | | | |
| phone. | | | | It is on the basis of the SIM card provided |
| | | | by mobile phone services providers that a |
| The SIM card is in the form of a tiny chip | | | | bill is generated at the end of a billing |
| which is actually a microprocessor that | | | | cycle, and the consumer is charged according |
| stores all the data and information of the | | | | to the usage. |
| mobile phone. The main feature of this chip | | | | |