The frequency is measured in Hz. Low frequencies can send the signal farther. Higher frequencies provide better connections and the voice communications are generally clearer. Four main frequencies are used around the world: Today there are mobile phones that work on two, three or four frequencies.
The most advanced phones work on all frequencies. They are called 'world' phones and can be used everywhere. There are different kinds of phones. A flip phone flips open, and is best for calling. A bar phone is shaped like a candy bar, and the keys and screen are on one face. A slate phone is a phone that has almost no buttons, and uses a touchscreen. Most smartphones are slates. A slider phone slides on rails. It can slide out number keys or a mini keyboard , but some do both.
A swivel spins on an axle. When a mobile phone is switched on, its radio receiver finds a nearby mobile phone network base station, and its transmitter sends a request for service. Computers in the base station check if the phone is allowed to use the network. The base station covers an area called a cell. A phone can move between different cells, but will only communicate with one cell at a time.
This is why mobile communications are sometimes called cellular communications. Once connected to a station, the mobile phone can make calls. Because the network knows that the phone is connected to that particular cell, it can also route calls to the mobile phone. Sometimes the radio connection to the cell is lost, for example when you go underground.
This means the phone cannot make or receive calls until the connection is made again. The network is the company that provides the phone service. In most areas there will be more than one mobile network. Customers choose networks based on how well the different networks work in their area, or by price. Mobile phones use different technical standards. The SIM has information like the phone number and payment account and this is needed to make or receive calls.
The SIM may be supplied by the same company as the phone, or a different one. Sometimes you can change the network by using a SIM from another network, but some companies do not want this to happen and they lock the phone so that you have to use their SIM. The others have a special radio inside them that only makes phone calls when the phone is activated.
When someone buys a contract, the network gives them a code, that if they enter it into the phone, the phone will then make calls. It is usually impossible to switch to a different network's code on this type of phone. A majority of new mobile phones from the 21st century are smartphones. These phones are basically small computers. Besides calling, they can be used for email , browsing the internet , playing music and games , and many other functions that computers can perform.
Most smartphones run a common mobile operating system. In the United Kingdom cable operators are giving some five lakh extra subscribers per month. Presently China tops the list of the mobile user countries. India does not lag behind. It is fast approaching to equallize or even supercedes the status of China. When we think over the advantage of a cellular phone in comparison to the old rigid telephones, we can say that the greatest advantage of the cellular phone is that it can be used anywhere, anytime.
It can send a message, store a date. It can be used as computer and a whole world in one's hand. As for the instant information, nature of a cellular phone it has an advantage in life controlled by the information that continues changing by a minute unit of advanced information oriented society. Exchange of information has become do at sight by what was telephoned anywhere. By it, update speed of the whole information has become fast.
No doubt, it has changed the whole scenario of the world. The cellular phone or the mobile phone has become necessity for today's world. But the new generation is misusing it by distorting its uses.
Some innocent people are being exploited through it. MMS, video clippings, picture messaging are some of the ways which are being misused. There should be strict legal procedure against such distortion of this cellular age. One cannot deny the change in life with the change of time but when this change is over-exposed it is called pollution. We must balance these two phenomena in order to create a healthy world. Preserve Articles is home of thousands of articles published and preserved by users like you.
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