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Cell Phones

A Quick Note From The Publisher...

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What Is A SIM Card For A Cell Phone?

A SIM card for the phone is like having a small computer in your computer. The SIM card stores a lot of data such as your messages, whether text or pictures, your phone number, reminders, files, value added services etc. What determine the phone number are actually the card and not the phone. In fact the mobile phone company keeps track of all your calls whether incoming or outgoing through your SIM card. They can identify the precise city and country that you have taken the phone to. In this way, the company charges you for the calls. The SIM card is actually called a Subscriber Identity Module and is the size of a thumb impression. This tiny chip is a small microprocessor, but it packs in a lot of data and information. It's inserted into the back of the cell phone that one is using and only then can the cell phone be activated. As soon as the cell phone is activated, it's connected to the network of the cellular phone company. Thus one can start making and...