The advantages of buying mobile phone online include:
• Consumers get an opportunity to compare and contrast the prices of one handset with other handsets of another brand. Sometimes an individual likes to purchase Nokia cell phone because of its higher durability factor and on the other hand some may go for Sony Ericsson due to it powerful speaker quality.
• The detailed description about each of the handset on offer enable consumers to judge themselves which brand or handset to take and which one to ignore.
• Online websites also offers best mobile phone deals including contract mobile phone and payg mobile phone.
• These online websites have tie-ups with world's leading service providers and offer deals like T mobile phone, 3 mobile phone, O2 mobile phone and many more.
• Besides this, such websites also offer new and old mobile phones along with images of each handset.
All these benefits attached to online mobile shops attract millions of people to buy. However one should be careful while buying mobile phones online. The main negative part of online buying is fakeness. Many fake mobile shops promises to offer you best mobile phone deals but often deceive the consumers. Such website's main aim is to make profit by triggering consumers to go buying from their shop. Consumers easily get fooled by their false statements and get engulfed in their trap.
So always look out for credible and reliable online mobile shop dealer like "buy-phones" in the UK which offers comprehensive range of handsets and attractive cell phone deals.
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Charge your battery. The first thing you need to do with your Sidekick when you take it out of the box is plug it in and leave it alone for about four hours. It's tough, because you want to start exploring all the features, but a good initial charge will help you get more out of your phone.
Open up your phone. This feature is probably one of the reasons you got a Sidekick. To open the phone you need to flip the display screen clockwise. Place your thumb on the lower-left corner of the screen and gently guide it outward in a clockwise motion. The screen should smoothly rotate into place revealing the keyboard. Reverse the motion to close your phone.
Find the essential buttons on your Sidekick. The keyboard is located under the display. On the left side of the keyboard, you will find the power button and on the right side, you will find the directional pad. On the outside of the keyboard, you will find the menu button, jump button, back button and navigation wheel.
Familiarize yourself with the icons and indicators on your display. There is a battery icon that looks like a battery that will let you know how charged your battery is. There is also a temperature indicator that will appear above the battery if you phone is too hot or cold. Next to the battery icon is a signal indicator that will let you know how strong your current cellular reception is.
Make some calls. The Sidekick is so much more than just a cell phone, but you will probably still want to make the occasional call. There are two ways you can dial. The first is the open the phone and use the number keys on the keyboard. Once you have dialed, press the "Send Call" button to make your call. You can also call with the display closed. Scroll to the dial button, use the wheel to enter the numbers and press the "Send Call" button when you're done. Answer a call by pressing the "Answer Phone" button by click the wheel.
Use your user's manual to discover the multitude of other features your Sidekick has. This guide will get you started, but to get to know your Sidekick, you need to spend some time exploring. Send some text messages, browse the web, make some calls and explore all the features and options you can find on your Sidekick
The innovation and growth on the mobile phones front is astonishing. The top-end phones available now have the processing power and storage available in desktop computers just 4-5 years ago. Little wonder, then, that 2004 saw 674 million phones being bought, and estimates for 2005 stand at 730 million.
The mobile phone is rapidly becoming the uber device -- the one device that seems to have it all and becomes even more indispensable than it is now. Mobile phones have already started functioning as more than just communications devices. Mobiles serve as watches and alarm clocks. Even with the limited free games that come with basic phones, they are already good for "time-pass". They can also function as calculators.
In unfamiliar neighbourhoods, they tell us where we are. The address book and contacts list on phones is our social interface. Without the phone, many of us would be quite lost in connecting with other people. The calendar function on the mobile phones can help us track our lives. Phones can also function as radios. For some, the mobile phone also becomes a notepad -- send an SMS to oneself and make it a reminder service. Owners also have tended to customise phones, with their own ringtones, themes and wallpapers.
This is just for starters. Consider what some of the more advanced mobile phones are also doing:
A Mobile Telephone is defined as a 'portable electronic device for the purpose of telecommunications over long distances'. Which boils down to 'a telephone you can roam freely with'. Most current mobile phones actaully connect to a cellular networi of base stations (the cell sites themselves) which overlap to yield coverage and which also link to the standard landline public switched telephone network. It should be noted that mobile phones are distinct from household cordless telephones which generally operate only within range of a dedicated base station (though the distinction is blurring with mobile phones that can link via bluetooth to a home internet base station).
It should be noted, however, that the term mobile phone can refer to any type of mobile telephony device and also includes satellite phones and radio phones. In contrast cell(ular) phones refers only to those mobile phones that function via cellular base stations. Despite these distinctions, in common parlance the terms are used almost interchangeably.
t is generally accepted that the first truly portable 'modern' mobile phone was invented by Martin Cooper of Motorola Corp in 1973 and he made the first call on this handheld device on April 3rd and thus changed our world forever. However, it wasn't for a further eight years that NMT (Nordisk MobilTelefoni or Nordiska MobilTelefoni-gruppen, Nordic Mobile Telephone in English) introduced the first fully-automatic cellular telephone system.
Most current mobile phones work on what's termed 2.5G (sedcond and a halfth generation) which includes technologeis such as packet-switched connection and enhanced data rates and these networks support WAP, MMS (Multimedia Messaging Service), SMS mobile games, and search and directory but they exclude EDGE (Enhanced Data GSM Environment) and GPRS (General Packet Radio Service) technologies. The reality is that most non-3G telephones sold today adhere to 2.5G standards and technologies rather than 2G and texting services such as SMS, MMS and picture messaging have become standard features of mobile telephones.
Though electronically complex, how a mobile phone works can be defined in fairly simple terms: In effect, the phone is simply a means of converting the owner’s voice into a digital signal that can be transmitted via the phone’s antenna to a receiving station. At the same time the telephone receives an incoming signal from the receiving station via its antenna which the phone converts into the voice of the person on the other end of the call.
Most phones today have a SIM (Subscriber Identity Module) card that is a specialized form of flash memory. This card stores information such as address books, contacts, calendars. But it also holds other very important data that the user cannot normally access. Indeed, the first time a new mobile phone is used (actually, to be precise, the first time a new SIM card is used in a phone) a number held on the SIM card called the International Mobile Subscriber Identifier (IMSI) number is transmitted to the network. The network then looks this number up in a database to ensure the SIM card is registered there. If this is the case then a number called the Temporary Mobile Subscriber Identity (TMSI) is encrypted and sent back to the phone where it is stored in the SIM card. In all subsequent calls the phone uses this TMSI number to identify itself by broadcasting the number to the network.
Each time a call is made the TMSI is transmitted to the network. The transmission of this number is followed by a complex series of events — each designed to verify that the phone and the phone’s owner are who they actually claim to be. Once this is verified a mobile telephone call can be made. The usual thing to do at this point is to dial a call using the telephone’s keypad. This is modelled on the numeric keypad of landline telephones for the sake of familiarity. Though, as phones are increasingly used for data and message transmission the keypads can access a wide range of characters and some phones now come with full computer keypads. There is also a move away from the traditional numeric keypad, such as in Apple’s iPhone which uses a touch sensitive bezel that is similar to the one found on Apple’s iPod range of music players.
In terms of being able to make and receive mobile telephone calls then the control channel of the mobile telephone network is all important as it's this that infroms the network where your phone is so that you can connect to the appropriate cell. This is a signal broadcast by mobile telephone transmitter towers and it's this which tells the system which cell you are in, so that this information can be stored in the system's database. It is entirely because of this that an incoming call can be routed to your phone.
The mobile phone can be used to communicate over long distances without wires. It works by communicating with a nearby base station (sometimes called a "cell") which connects it to the main phone network. As the mobile phone moves around, if the mobile phone gets too far away from the cell it is connected to, that cell sends a message to another cell to tell the new cell to take over the call. This is called a "hand off," and the call continues with the new cell the phone is connected to. The hand-off is done so well and carefully that the user will usually never even know that the call was transferred to another cell.
Before cell phones became almost universal, the only way you could contact people when you were in public was either to use a Pay Phone, or a very expensive mobile telephone (price equivalent in the 1950s to about US$1000 to US $3000, today), and the rates then were as high as $1 a minute. They also needed so much power that you had to have them in an automobile to use them. A mobile telephone used a single frequency and did not share it. Thus for a given region - say New York City - there might only be the capacity for 30 or 40 simultaneous conversations in the entire city.
Later someone got the idea for radio telephones to have the base station that talks to all of the phones use less power, thus more base stations could be used, allowing more phones in an area. Also, for cellular phones, a lot more frequencies became available, plus phones could change what frequency they used when they were operating (which means you weren't tied to your local telephone company's network), and the capacity to make a base station's power reduced so that more base stations could be added in crowded areas, meant that the network could handle more simultaneous users. A lot more. Current Cell networks are designed with 666 channels broken into six "cells" so that in any specific cell, only 111 of these channels are used. As a phone moves, the base station tells it which of the six cell groups it will move to and which of the 111 channels in that cell to use. Think of a honeycomb, where each cell faces six others, and thus the cell concept can provide much more service than the old mobile telephone system.
Since a cell phone essentially allows the person to be anywhere, and to move around while calling, they became extremely popular for business people. The high amount of usage caused prices to drop, thus making them affordable for almost anyone. Monthly plans giving boatloads of minutes are available for rates as low as US$30 or $40 a month. Prepaid service has dropped the price to have a cell phone to less than $100 a year, with as much as a couple hours of use a year included in the price. In Israel, the price of service is so low - circa 2c a minute or less - that soldiers in the military - which is almost everyone due to universal conscription - have been told to leave their cell phones home, lest enemies use the phones to target them.
The basic concept of cellular phones began in 1947 when researchers looked at crude mobile (car) phones and realized that by using small cells (range of service area) with frequency reuse could increase the traffic capacity of mobile phones substantially, however, the technology to do it was nonexistent.
Anything to do with broadcasting and sending a radio or television message out over the airwaves comes under a Federal Communications Commission (FCC) regulation that a cellular phone is actually a type of two-way radio. In 1947, AT&T proposed that the FCC allocate a large number of radio spectrum frequencies so that wide-spread mobile phone service could become feasible and AT&T would have a incentive to research the new technology. We can partially blame the FCC for the gap between the concept of cellular phone service and it's availability to the public. Because of the FCC decision to limit the cellular phone frequencies in 1947, only twenty three cellular phone conversations could occur simultaneously in the same service area - not a market incentive for research.
The FCC reconsidered it's position in 1968, and stated "if the technology to build a better mobile phone service works, we will increase the cellular phone frequencies allocation, freeing the airwaves for more mobile phones." AT&T - Bell Labs proposed a cellular phone system to the FCC of many small, low-powered broadcast towers, each covering a 'cell' a few miles in radius, collectively covering a larger area. Each tower would use only a few of the total frequencies allocated to the cellular phone system, and as cars moved across the area their cellular phone calls would be passed from tower to tower.
In the very beginning, two-way radios (known as mobile rigs) were used in vehicles such as taxicabs, police cruisers, ambulances, and the like, but were not mobile phones because they were not normally connected to the telephone network. Users could not dial phone numbers from their vehicles. A large community of mobile radio users, known as the mobileer, popularized the technology that would eventually give way to the mobile phone. Originally, mobile phones were permanently installed in vehicles, but later versions such as the so-called transportables or "bag phones" were equipped with a cigarette lighter plug so that they could also be carried, and thus could be used as either mobile or as portabletwo-way radios. During the early 1940s, Motorola developed a backpacked two-way radio, -Talkie and later developed a large hand-held two-way radio for the US military. This battery powered "Handie-Talkie" (HT) was about the size of a man's forearm.
In Europe, radio telephony was first used on the first-class passenger trains between Berlin and Hamburg in 1926. At the same time, radio telephony was introduced on passenger airplanes for air traffic security. Later radio telephony was introduced on a large scale in German tanks during the Second World War. After the war German police in the British zone of occupation first used disused tank telephony equipment to run the first radio patrol cars.[citatio needed] In all of these cases the service was confined to specialists that were trained to use the equipment. In the early 1950s ships on the Rhine were among the first to use radio telephony with an untrained end customer as a user.
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