Friday, April 24, 2009

Learn how to use Your Mobile Phone Cell Phone

Learn how to use Your Mobile Phone Cell Phone
Life without a cell-phone… how did we survive without them? From a fashion statement, status symbol, luxury to a necessity, the journey of cellular telephones has been one of great technological advancement. But do we, who take these "cells" for granted, ever think of the technology behind it? A cell phone service is based on a simple idea. It is like a two-way radio, turned into a circuit switched telephone network, comparable in functionality to its landline counterpart. We had wireless sets before, used by security, police, organizers etc. but cell phones were not only accessible easily, they were more personal.

THE CELLULAR TECHNOLOGY There is a type of low power two-way radio base station, which serves a coverage area, divided into many smaller zones (cells). Telephone handsets continuously search for the closest base station, and hop from base station to base station if the user was on the move. This strategy of replacing one high power base station with many low power base stations distributed throughout the coverage area made it possible to handle far more subscribers, and reduced the power requirements for wireless telephones.
Reducing the amount of power needed to carry a conversation through the airwaves, made it possible for manufacturers to produce much smaller phones. While solid state circuitry advances have played an important role in reducing the size and weight of portable phones, the reduction of power requirements eliminated the need for bulky, heavy batteries to power handsets.
The first cellular telephone network put to widespread use was an analog system called AMPS. An AMPS is an analog, frequency modulation scheme (the same scheme used in FM radio). At the time cellular was introduced, FM modulation/demodulation circuitry was a commodity product, and so this was the most cost effective way to introduce cellular service. Digital cellular did not become cost effective until the 1990s when DSP based platforms came down in price enough to make it practical to create an all-digital telephone handset.

Scan Channels: A scan for the closest cell site near you is made, so that you can get the strongest signals possible due to your location at the moment.
Send Message: The phone then sends a short message to the cell site verifying the MIN, ESN, and the number that you have just entered to call.
Assign Channel: After verifying the above information and your number, the base assigns a message to your phone, telling it where the conversation is. Talk: The phone then gets on that channel and begins to ring.

A cell phone has become easily accessible today, as it can fit in most pockets. (pun intended!) a decent cell-phone will be available starting Rs. 5000/- and of course, the sky is the limit if you want an expensive model. Another thing to note is that cell phone prices are going down as the market becomes more competitive.
Small is in. At least where the cell phones go. The new tiny single-chassis phones are called "candy bar" models, a reference to their shape. Many weigh less than 200 grams, battery included. The familiar squat flip-phones -- those that open like communicators from the old "Star Trek" -- also are ultra-light.
Batteries are getting smaller too. New nickel metal hydride (NiMH) batteries are smaller and lighter than the Nickel Cadmium (NiCad) batteries, but often provide about 40 percent less power. The latest batteries are the Lithium Ion (Li-Ion) and the Lithium Polymer batteries, which are of superior quality.
The Cellular Telecommunications Industry Association (CTIA) is a standard performance testing association for cell phones. Like an ISI seal, it too has an approval seal.

WHAT CAN GO WRONG WITH A CELL PHONE Your cell phone is tailor-made to deal with tough conditions, which come from the fact that it is a mobile service. But nonetheless, the instruments can take only so much abuse, and are susceptible to breaking.

If your phone gets wet, or if you dial the numbers with wet hands, and water gets into the buttons and internal corrosion may occur. Make sure your phone is dry, especially when it is switched on.
Using a belt-clip or a holster keeps the cell phone firmly in its place, and prevents it from falling off accidentally.
Try not to stuff your phone in with all your other worldly possessions, it may cause the glass display screens to crack.
Extreme heat can cause damage to the cell phone electronics and the cell phone battery. Extreme cold can also cause a temporary loss of the display screen.

Do not use the cell phone in heavy traffic.
Do not dial while driving, if it is so important, ask someone to call for you. If you are alone, pull over on the side and dial.
Use your cell phone for short calls.
Be prepared to end your phone call abruptly.
Use memory-dialing options. Learn to use your phone without having to look at it.
Never take notes while driving.
Make sure your phone is easily reachable when driving.

VARIOUS OPTIONS Cellular Phone Carrier:
The normal subscription system, where you get a monthly bill for all calls made.
Prepaid Cellular Phone:
You pay for the service in advance, where the amount in your account is debited with per call made. When the account has been used, you have to get a new card. A pre-paid phone service does not require the initial investment as the monthly service. However, the per call cost is more in a pre-paid. Also, benefits like free night-talk, and others are not available.
Cellular Phone Accessories:
Extra batteries, vehicle antennas, battery chargers / conditioners, battery eliminators, hands free kits, and leather cases, are all the accessories available.
Hands Free:
An important safety feature that's included with most of today's mobile phones. It permits drivers to use their cellular phone without lifting or holding the handset to their ear. You can speak into your handset by placing it near you during a conversation.
Voice Activated Dialing:
A feature available only on selected phones and hands-free car kits that permits you to dial numbers by calling them out to your cellular phone, instead of dialing them manually. This function is especially convenient for making calls from your vehicle while driving.

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