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Howstuffworks "how cell phones work"

Cell phone. Cell-phone model, you can: Store contact information Make task or to-do lists Keep track of appointments and set reminders Use the built-in calculator for simple math Send or receive e-mail Get information (news, entertainment, stock quotes) from the Internet Play simple games. Integrate other devices such as PDAs, MP3 players and GPS receivers But have you ever wondered how a cell phone works? What makes it different from a regular phone? What do all those terms like PCS, GSM, CDMA and TDMA mean? In this article, we will discuss the technology behind cell phones so that you can see how amazing they really are. If you are thinking about buying a cell phone, be sure to check out How Buying a Cell Phone Works to learn what you should know before making a purchase. Want the best cell phone? For expert reviews of the best new cell phones, check out our partner site Consumer Guide Products. One of the most interesting things about a cell phone is that it is actually a radio -- an extremely sophisticated radio, but a radio nonetheless. The telephone was invented by Alexander Graham Bell in 1876, and wireless communication can trace its roots to the invention of the radio by Nikolai Tesla in the 1880s (formally presented in 1894 by a young Italian named Guglielmo Marconi). It was only natural that these two great technologies would eventually be combined. In the dark ages before cell phones, people who really needed mobile-communications ability installed radio telephones in their cars. In the radio-telephone system, there was one central antenna tower per city, and perhaps 25 cha cell phone		  

Howstuffworks "how cell-phone radiation works"

Hone Facts - Consumer Information on Wireless Phones (Information Provided By: FDA and FCC) Wireless Phones Description Safety Interference with Medical Devices Research Radiofrequency Energy Description Safety Research Base Stations Description Safety Safety Standards Description Standards About My Phone SAR Values for Wireless Phones Additional Information Hearing Aids and Cell Phones Other Sources Glossary Contact Us See New Information On: Use of Wireless Communication Devices and the Risk of Brain Cancer Wireless telephones are hand-held phones with built-in antennas, often called cell, mobile, or PCS phones. These phones are popular with callers because they can be carried easily from place to place. Wireless telephones are two-way radios. When you talk into a wireless telephone, it picks up your voice and converts the sound to radiofrequency energy (or radio waves). The radio waves travel through the air until they reach a receiver at a nearby base station. The base station then sends your call through the telephone network until it reaches the person you are calling. When you receive a call on your wireless telephone, the message travels through the telephone network until it reaches a base station close to your wireless phone. Then the base station sends out radio waves that are detected by a receiver in your telephone, where the signals are changed back into the sound of a voice. The Federal Communications Commission (FCC) and the Food and Drug Administration (FDA) each regulate wireless telephones. FCC ensures that all wireless phones sold in the United States fo cell phone


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cell phone K or to-do lists Keep track of appointments and set reminders Use the built-in calculator for simple math Send or receive e-mail Get information (news cell phone, entertainment cell phone, stock quotes) from the Internet Play simple games. Integrate other devices such as PDAs cell phone, MP3 players and GPS receivers But have you ever wondered how a cell phone works? What makes it different from a regular phone? What do all those terms like PCS cell phone, GSM cell phone, CDMA and TDMA mean? In this article cell phone, we will discuss the technology behind cell phones so that you can see how amazing they really are. If you are thinking about buying a cell phone cell phone, be sure to check out How Buying a Cell Phone Works to learn what you should know before making a purchase. Want the best cell phone? For expert reviews of the best new cell phones cell phone, check out our partner site Consumer Guide Products. One of the most interesting things about a cell phone is that it is actually a radio -- an extremely sophisticated radio cell phone, but a radio nonetheless. The telephone w cell phone.

cell phone E built and improvements are constantly made cell phone, so the most recent comments are most reliable. But when determining which provider to go with cell phone, get a general feel rather than focusing on individual comments. Eventually cell phone, as you read through the comments cell phone, you can see a general trend as to which service provider is superior in the area. Hopefully this will give you more of an idea rather than walking into a service plan blind. Add Reception Tower Search To Your Website... Free Do you want to give your visitors access to the largest cell phone reception tower database? Simply go here and fill out the form and we'll send you the HTML code to add it directly to your own site cell phone, free of charge! Free Cell Phones Free Camera Phones Free Smartphones Cell Phone Coverage Search Cell Phone Tower Search -- AK AL AR AZ CA CO CT DC DE GA FL HI IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NE NH NJ NM NV NY OH OK OR PA RI SC SD TN TX UT VT VA WA WI WV WY & 169;2002-2006 Mobiledia Corp. A Cell Phone Res.

cell phone Ll phones and cancer: What is the evidence for a connection? Radiat. Res. cell phone, 151:513-531 cell phone, 1999.On line version available. 65) JA D'Andrea: Behavioral evaluation of microwave irradiation. Bioelectromag 20:64-74 cell phone, 1999. 66) AW Preece cell phone, G Iwi et al: Effect of a 915-MHz simulated mobile phone signal on cognitive function in man. Int J Radiat Biol 75:447-456 cell phone, 1999. 67) RD Saunders cell phone, CI Kowalczuk et al: Studies on the induction of dominant lethals and translocations in male mice after chronic exposure to microwave radiation. Int J Radiat Biol 53:983-992 cell phone, 1988. 68) Royal Society of Canada: A review of the potential risks of radiofrequency fields from wireless telecommunication devices. Royal Society of Canada cell phone, Ottawa cell phone, Ont cell phone, 2000. - Also published as: D Krewski cell phone, CV Byus et al: Potential health risks of radiofrequency fields from wireless telecommunication devices. J Toxicol Environ Health 4:1-143 cell phone, 2001. - An update published as: D Krewski cell phone, CV Byus et al: Recent advances in research on radiofrequency.

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cell phone E50 is for people who want a single phone for both business and leisure use. Built on S60 3rd edition smartphone platform and Symbian OS for enhanced security features and device control, the Nokia E50 supports popular corporate mobile email solutions, including Intellisync Wireless Email by Nokia, BlackBerry Connect, Visto Mobile, Altexia, and Microsoft A... Continue reading Nokia E50 Introduced for Business Users Discuss (2) Sony Ericsson Showcases the Z550 Clamshell Thu May 18, 2006 10:07 pm Sony Ericsson Z550i More Photos Sony Ericsson today announced the Z550, a clamshell manufactured from a premium brushed metal and high gloss material. The 1.3-megapixel camera has 4x digital zoom and takes great snap shots and video for capturing those unpredictable moments. These can be viewed on a crisp, bright color display. With 20 MB of onboard memory expandable to 1 GB, it's simple to store and share a large collection of pictures using MMS, Bluetooth or e-mail. Finding shots once stored

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