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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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PositiveSMS free pc to mobile software for text messaging
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Defense wants cellphone records in Jennifer Hudson family slaying - Chicago Tribune

Chicago Tribune

Defense wants cellphone records in Jennifer Hudson family slaying
Chicago Tribune
New details about the prosecution's case against William Balfour emerged during a hearing in which the defense sought to quash the arrest and throw out evidence from a search, including a cellphone that detectives used to place Balfour near the murder ...
Accused murderer's lawyers want to talk with Jennifer HudsonChicago Sun-Times

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Cell Phones Have Changed Our Lives - Huffington Post

cell phones Have Changed Our Lives
Huffington Post
If, in March of 2008, Raul Castro had imagined the role cell phones would play in Cuba's incipient civil society, he probably never would have authorized their use. Before that date, Cubans had to ask a foreigner to take out a cell phone contract and ...

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Senate passes bill banning cell phone use among teen drivers - Daily Herald

Universe.byu.edu

Senate passes bill banning cell phone use among teen drivers
Daily Herald
SALT LAKE CITY -- The Utah Senate decided that 16- and 17-year-old drivers need to hang up their cell phone when they are behind the wheel. The Senate approved the cell phone ban in a vote of 19-9 on Tuesday. The bill will allow police officers to tag ...
Bill bans cell phone use for teen driversFox 13 Now - Salt Lake City
Bill would ban cell phones for driving teens in UtahUniverse.byu.edu
Utah Legislature: Teen cell phone restrictions pass; TV tax doesn'tDeseret News
KSL-TV -KCPW (blog) -The Republic
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Cops hunt for cell-phone snatcher - WTNH

Cops hunt for cell-phone snatcher
WTNH
She told police that while she was texting, a dark-skinned male grabbed her cell phone and ran off the bus. The male is described as a 16 to 18 year-old, 5'7" with a thin build. He was wearing a black hoodie and dark-colored jeans.
Police Release Video of Phone SnatchingNBC Connecticut
Hamden police release surveillance video of CT Transit robbery suspectNew Haven Register
Hamden Police Release Video Of TheftHartford Courant

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Cameras catch thieves in cell phone stores - KPRC Houston

abc13.com

Cameras catch thieves in cell phone stores
KPRC Houston
Surveillance cameras were rolling as masked men broke into Sprint cell phone stores across Houston. At least three stores were hit early Tuesday morning. Scott Aronstein owns several Sprint stores in the Houston area. His store on Shephard and ...
Smash and grab burglars target Sprint storesabc13.com
Store owners frustrated over repeated smash-and-grab robberiesKHOU

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Postal worker dies trying to recover cellphone from drainage ditch - Sun-Sentinel

CBS Local

Postal worker dies trying to recover cellphone from drainage ditch
Sun-Sentinel
Police said he was apparently trying to grab a dropped cellphone. "It's one of those unforeseen freak accidents," said Miami-Dade County police Detective Javier Baez. Shelby Wing had just celebrated his 70th birthday on Sunday and was planning to ...
Postal Worker Dies Trying To Retrieve Cell Phone From Storm DrainHuffington Post
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DA: Child porn on peeping Tom's cellphone - Boston Herald

My Fox Boston

DA: Child porn on peeping Tom's cellphone
Boston Herald
By Natalie Sherman A cache of child porn was found on the cellphone of a man accused of using the same phone to videotape women showering in a Somerville YMCA locker room after their workouts, Middlesex District Attorney Gerry Leone said today.
Somerville man indicted on charges of videotaping women at YMCAWicked Local
Somerville Man Indicted for Filming Women in YMCA Locker RoomPatch.com

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Cell phone video shows APD officer kicking, punching man - KOB.com

KOB.com

Cell phone video shows APD officer kicking, punching man
KOB.com
A bystander caught cell phone video when a fight broke out on Central Avenue Friday night. The video clearly shows an APD Officer Andrew Hsu punching and trying to detain Jayson Bernard. Bernard said he was not a part of the fight.
Cellphone video catches Albuquerque police officer kicking, punching manThe Republic
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Locking Out Cell Phone Hackers - WOWT

Locking Out Cell Phone Hackers
WOWT
Amber Michalski is one of more than 200-million cell phone users in the United States. As the number grows, so does the threat from hackers. Amber told Channel 6 News, "I'd like to think I'm a little more security conscious than the average person so I ...



HB Council OKs New Cellphone Tower Approval Process - VoiceofOC

HB Council OKs New Cellphone Tower Approval Process
VoiceofOC
In response to recent community concerns over cellphone towers beside schools and homes, the Huntington Beach City Council Monday night narrowly passed changes to the approval process that will include public hearings. The most significant change is ...

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