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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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Cell phone: a new Entertainment Device for all
Video games. No no. Handy radio sets. No no. Wireless phones. No no. Cameras. No no. Why would anybody keep so many gadgets if all these options are available in one gadget. All in one. Thats what a cell phone is. No matter what you want to do- play a game, listen to music or talk to somebody- all you need to have is a cell phone. In a matter of time, cell phones have graduated from being only a phone to an entertainment device for all. Its not long ago when cell phones were a style statement of the rich and the famous. The known and the well known used to flaunt their position by keeping a cell phone. An ordinary man could not even think of buying a cell phone because he could not 'afford' and 'manage' it then. But the present day scenario is totally different. Leave alone being rich, one does not even require to be near to rich to keep a mobile. Right from a college student to a daily wage earner, everybody keeps a cell phone now. Thanks to...
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Waupaca County Passes Cell Phone Ban for Drivers - WBAY

Waupaca County Passes cell phone Ban for Drivers
WBAY, WI - 4 hours ago
If you're driving through Waupaca County, you'd better hang up your cell phone. The county board passed an ordinance prohibiting talking, listening, ...
cell phone users in Waupaca County unplugged New Richmond News
Waupaca County bans hand-held cell phones while driving New Richmond News
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Case of explicit cell phone photo dropped - DetNews.com

WHMI

Case of explicit cell phone photo dropped
DetNews.com, MI - 15 hours ago
FOWLERVILLE -- No charges will be filed against students involved in distributing an "inappropriate" cell phone photograph of a 14-year-old girl at ...
No Charges To Be Filed In Fowlerville cell phone Pic Case WHMI
Prosecutor: No charges in Fowlerville nude pic case Livingston Daily
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Cell Phone Recycler Lists Most Commonly Recycled Models - LiveScience.com

Cell Phone Recycler Lists Most Commonly Recycled Models
LiveScience.com, NY - 11 hours ago
By Trey Granger, Earth911 Cell phone recycler ReCellular, which is expected to collect six million phones in 2008 for reuse or recycling, has released the ...
Top 10 Recycled Mobile Phones Of 2008 CRN
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Femtocell FAQ: Is it time for your own 'personal cell-phone tower'? - Computerworld

Femtocell FAQ: Is it time for your own 'personal cell-phone tower'?
Computerworld, MA - 17 hours ago
By Ed Sutherland November 19, 2008 (Computerworld) Are you one of those unlucky souls who enjoys decent cell phone reception when you're out and about, ...


Cell Phone Makers Go Green With Chargers - InformationWeek

Reuters

Cell Phone Makers Go Green With Chargers
InformationWeek, NY - 2 hours ago
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2 more cell phones found on Texas' death row - Houston Chronicle

2 more cell phones found on Texas' death row
Houston Chronicle, United States - 14 hours ago
Holiday and the unidentified owner of the second cell phone face disciplinary action and could be classified in a more restrictive manner including a loss ...
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Wirefly Announces its "Top 10 Hottest Selling Cell Phones" and ... - MarketWatch

Wirefly Announces its "Top 10 Hottest Selling Cell Phones" and ...
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Training helps officers crack cell phone evidence - WTHR

Training helps officers crack cell phone evidence
WTHR, IN - 1 hour ago
Edinburgh - They are convenient, but you probably don't know that information you put on a cell phone can also be evidence in a police investigation. ...
MDOT joins cell phones program Biloxi Sun Herald
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Wisconsin county passes cell phone driving ban - Minneapolis Star Tribune

Wisconsin county passes cell phone driving ban
Minneapolis Star Tribune, MN - 9 hours ago
Using anything other than a hands-free cell phone while driving in Waupaca County will cost you. Board supervisor Jack Penney says the county is first in ...
Waupaca Co. becomes first Wis. county to ban cell phones while driving Sheboygan Press
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AT&T and OASIS Host 'Cell Phones for Seniors' Event in Syracuse ... - MarketWatch

AT&T and OASIS Host 'Cell Phones for Seniors' Event in Syracuse ...
MarketWatch - 7 hours ago
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