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

Cell Phone Batteries, Money Saving Tips
It’s hard to imagine what the world did before the use of cell phones! We have become so dependent on having a cell phone that we tend to panic if we forget it at home or if the battery dies. Cell phones are an important part of most everyone’s life that allows them to be reachable 24/7 for family, friends and business associates to contact them. When considering a new cell phone purchase it is also important to consider the cell phone batteries also. Below are some tips to help. Cell Phone Battery Capacity: For more talk time and stand by time in between phone charges you should go with a high capacity cell phone battery. However, when choosing a high capacity cell phone battery, there will also be a greater weight in size. With bigger cell phone batteries your cell phone may not fit into cell phone protectors, pockets and such. If you plan on traveling a lot with your cell phone, this may pose a problem as your phone may not be as readily available. Getting what...
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