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What Is A SIM Card For A Cell Phone?

Author: Johnny McKenzie


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 receiving calls.

Therefore when you switch over to another mobile company, you need to purchase another SIM card to make and receive calls. SIMS can have a memory of 16kb to 64kb as of today. Of course with convergence happening, SIM may have larger memories to take care of many operations.

There are two types of connections for SIM cards. One is a prepaid connection where you for a fixed calling value, let's say $10, can get for example 100 minutes of talk time. The second option is that of post paid. After every billing cycle, the cellular company will charge you upon the usage.

About the author:

Johnny enjoys making cheap phone calls using calling cards and he run a site about long distance phone cards.




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A Quick Note From The Publisher...

If you like the article above, you may be interested in the following article which is also related to Cell Phones...

Cell Phone As Your Primary Line
If you find a good service and affordable features, or spend a lot of time away from home, then consider going totally wireless. Many cell phone customers are now using their cell phone as their primary phone line. As the number of cell phone subscriber continues to rise, the monthly fee for basic cell phone service are falling. If you spend a lot of time away from home or constantly have business phone calls forwarded to your cell phone, you can make your cell phone your primary phone line. As more Americans go wireless, the wireless industry has responded with more choices and lower prices for basic plans. You can send email, text messages, surf the web, listen to music and even take pictures with your cell phone. You can keep in touch and entertain yourself with your cell phone. Free nights and weekends, free long distance and of course, going from two phone bills to one, make this a very attractive option. If you are ready to make the leap to wireless only, there are many,...
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