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Sunday December 24th, 2006 03:22 AM
How does a Mobile Phone Work?
Wireless telephones / Cell Phones / Mobile Phones 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.
Are mobile phones safe for children to use?
From the evidence currently available, there are no known adverse health effects from the use of mobile phones by children or adults. The World Health Organisation (WHO) states: 'Present scientific information does not indicate the need for any special precautions for use of mobile phones. If individuals are concerned, they might choose to limit their own children's radio frequency exposure by limiting the length of calls, or use 'hands-free' devices to keep mobile phones away from the head and body.
How many Mobile Phones are there in the world?
There are an estimated 550 million mobile phones in circulation around the world.
Can Mobile Phone Calls be intercepted?
Two methods are used to transmit wireless calls over the air, analog and digital. If you are concerned about whether your conversation will be overheard, digital signals are considered more secure because the sophistication and complexity of a digital system makes interception of calls virtually impossible.
Text Message Facts?
78 million text messages were sent by Britons on Valentine's Day 2003, 6 times more than traditional cards and a 37% increase on text figures for 2002.
On New Year's Day 2004, the number of UK text messages reached 111 million, the highest recorded daily total.
More facts about Mobile Phones to come soon...
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