Mobile phones or cell phones are electronic gadgets which are portable and can be seen in every second person`s hand or pocket these days. Teenagers swear by it and their lives revolve around it. Take away a teenagers cell phone and he will be half dead!

The cell phones are portable and have a long range. You can use it for various purposes like talking, sending and receiving short messages, storing your various contact details, sending and receiving e mails, and whole lot of other things which vary from model to model, and the special features that your handset may be having. Cell phone can be called a miniscule computer in your pocket, such great and varying are the features. Listen to music, watch TV, play games, click pictures. The list is exhaustible.

Cell phones have now become an extension of one`s personality but there is a big hue and cry over the environment and health issues involved. It is being researched that does using the cell phone really increase the chances of cancer or tumor? There was a report the other day that those who have pace makers shouldn`t keep cell phones in their breast pocket as the cell battery may affect the heart beat rates. Again there are other researchers who insist that cell phones may lead to permanent brain damage. It is a topic for countless debates all over the globe with the risks outweighing the benefits by a large margin!

Leaving aside the debatable health issues there is one issue over which there is no conflict. That is, accidents are caused while driving because of talking and driving simultaneously. By the data collected it has been well established that talking on the phone while driving increases the chances of making mistakes manifold. This has led to an increase in the number of accidents quite a lot.

There is a great variety of cell phones available in the market and you may get thoroughly confused with the wide array of features available. You may not know which one is suitable for you. Here are few tips to help you choose the cell phone meant for you.

If you know that your phone is going to be rough handled then you shouldn`t go for flip phones. They tend to break with rough handling. You should select something from candy bar styles, clamp bell styles or non flip phones. Sliders and twist phones are also a good option for you. Hence keep your usage and lifestyle in mind before deciding upon the type of phone you intend to buy.

Depending on your choice and budget you can go for the thickest or the slimmest handset. There are various choices and you may select any.

Take care that you can talk at least for four hours on battery and you must be able to use the phone for at least 2 days without charging the battery. Much depends on your usage also. The battery will drain faster if you talk more.

Select a PDA phone if you go online quite frequently or if you send lists of long sms.

Last but not the least before you start using the cell phone you must know cell phone etiquettes. The cell phone ringing at most somber of occasions like a funeral or formal event like a speech, concerts and serious music are insulting to the performer. Quite a few people talk over the phone in high pitch in public. All this should be scrupulously avoided otherwise your own standard of manners and etiquettes go down apart from the fact that everyone can hear what you are discussing.

Keep the tips given above in mind and be a smart cell phone user! This article can also be accessed in portuguese language from the Article section of page www.polomercantil.com.br/celular.php
Roberto Sedycias works as IT consultant for www.PoloMercantil.com.br Business Logo Design

Cell phones (telefone celular) or mobile phones have had a great impact on the way we lead our lives. In today’s world, where change is the only constant, cell phones have been upgraded with lots of new technological features. There has been a tremendous growth in the use of cell phones all over the world and now almost anybody has a personal cell phone. What started in 1960s as a bulky radio communication equipment to be used at the time of war, it has now become a small pocket device with a host of special features specially crafted for the common consumer.

It satisfies more than the basic need to communicate. It is a fashion statement – an identity of self – and it comes in hundreds of models. Nokia is the world’s largest manufacturer of cell phones followed by Motorola, Samsung, BenQ, Siemens, Panasonic, Philips, LG, NEC, Sony Ericsson, Fujitsu and many more. Apart from calling and texting, cell phones are used for a variety of purposes – to keep contact information, to make task lists and daily schedules, browse mobile websites and check emails, play games, watch video clips, listen to music, take pictures and much more. Also cell phones (telefone celular) are easy to integrate with other electronic devices such as notebooks, music systems and etc. With the availability of infrared and Bluetooth technology, a lot of wireless connectivity is possible, such as the use of wireless headphones. Also you can make your phone interact with your notebook without any physical connection.

So, what should you look for while purchasing a new cell phone (telefone celular)? The points to consider include the service plan, price, size, weight, features and technical specifications, compatibility with other devices, display screen resolution and a very important feature: battery life. The latest features offered by cell phones are mega pixel camera, wireless connectivity, modem capability, PC synchronization, music and video player and a lot more.

Today, you can access the World Wide Web through your cell phone (telefone celular). To access internet, your cell phone has to be WAP-enabled. Many companies have created mobile compatible websites that make browsing on your phone very easy. You can get the latest news, stock quotes and game scores on the move through your cell phone. The advanced third-generation phones (3G phones) will soon storm the market and will have high-end graphical display that will enable better video conferencing and gaming experience.

Everybody must follow basic cell phone (telefone celular) etiquettes. Your mobile should not ring in public and disturb others. Sometimes mobile phones ring at odd instances like in movie theatres, weddings, funerals, important official meetings, etc., and to top it the fancy ring tones disturb everybody else around you. You should keep your cell phone in the silent mode when you are at a public place and you must never talk on the cell phone while driving. This might put you in trouble in many countries as there are heavy fines on cell phone misuse.

Cell phones (telefone celular) have become an intrinsic part of our lives that most of us cannot imagine a single day without it. Ring tones, caller tunes, mobile gaming, camera, texting, MMS and video messaging, audio and video recording and viewing are still not enough. New technologies are developed often to reduce size and weight, increase speed, provide a better user interface, to pack more high-definition features into a small pocket device. With GPS (global positioning system) capability, cell phones have become so useful that a person carrying one could be located to a range of a few meters, anywhere on the globe! GPS cell phones are important devices in locating users in emergency situations, which allows emergency services to be quickly dispatched. This article can also be accessed in portuguese language from the News Article section of page www.polomercantil.com.br/celular.php
Roberto Sedycias works as IT consultant for www.PoloMercantil.com.br search engine optimization service

Cell Phones, also known as Mobile Phones, have become a way of life. It is no exaggeration to state that in the modern times, it is almost impossible to lead a normal life without the help of cell phones. Believe it or not, several countries including the UK now have more mobile phones than people. If this sounds incredible to you, take a look at the following startling statistics:
- Around 80% of world`s population has mobile phone coverage as of 2006. This figure is expected to increase to 90% by the year 2010.
- In the United States, 50% of children own mobile phones.
- On a numerical basis, India is the biggest growth market adding about 6 million cell phones every month and it is expected to be 500 million by end of 2010.
The market for the cell phone is becoming over-crowded with scored of companies invading the market every quarter of the year. However, as per a recent survey, Nokia Corporation is the largest manufacture of mobile phones with a whopping market share of approximately 36% in the first quarter of 2007. Typically, the mobile phones are meant to play the same role as their stationary counterparts, i.e., landline telephones. However, the introductions of different high-end tools and ground-breaking technologies especially in the last decade have changed the concept of communication like never before.
With facilities such as SMS, Instant Messenger, Built-in MP3 player, Video recording, Internet, GPS and so on, the cell phone has become a key social tool. Ironic as it may sound, but now most cell phone users are keeping in touch with others using `SMS` and a brand-new culture of texting has developed in the process. Moreover, now cell phone users are increasingly customizing and accessorizing their cell phones by adding new features such as ring tones in order to boost their social status and reflect their personality.
Different cell phone manufacturers are well-known for offering some unique features in with their respective cell phones. Hence, often, it becomes difficult for the buyers to decide to settle for a particular brand when they go out shopping. The following are some useful tips on buying a cell phone that will not only reduce your inhibition to a substantial extent but also help you to shop smart. Here they go:
Accessories and Add-ons:
A wide-range of cell phone accessories and add-ons are now available at a lower cost. You can add these accessories, such as cell phone covers, screen protectors, bluetooth handsfree headsets, antennas, leather cases and etc, according to your needs. Quite a few well-know brands are offering these latest accessories for your cell-phones.
Price Guarantee:
While shopping for a cell phone online, ensure that the online store offers price guarantee. Otherwise, it will be a traumatic experience for you when you will find out that same item is available at a cheaper price in another store. Make sure the cell phone you are buying has some sort of price protection or guarantee.
Free Shipping:
When you purchase a cell phone online, see to it that the online store bears the cost of shipping. There is no point in buying a cell phone worth of $100 when you have to pay $30 towards shipping cost.
Quick Delivery:
Picture this: you checked that elegant and sleek designed cell phone, made the payment through credit card, and kept looking forward to its being delivered until you got frustrated and lost your priceless peace of mind. Who needs this sort of purchase anyways? It is indeed quite a harrowing experience to get your products delivered late. Supposing you have plans to pleasantly surprise a friend of yours by gifting her a cell phone on her birthday by having it delivered at her door-step. The last thing you want is your gift being delayed and reaching her late after her birthday. Allow a reasonable span of time for your being delivered at the desired destination.
Privacy Policy:
Usually, all e-commerce sites have their privacy policy stated on the homepage. However, it is up to read between the lines and ensure that you have fully understood privacy policy. All the personal information relating to customers should be protected and kept confidential at all cost. This article can also be accessed in portuguese language from the Article section of page www.polomercantil.com.br/celular.php
Roberto Sedycias works for www.PoloMercantil.com.brfind public records

No one doubts that cell phone is one of the most used consumer electronics worldwide. But have you ever asked yourself how does a cell phone work? What is a cell phone?
The amazing fact about a cell phone is that it is a radio – a very special one. The gurus in the line are Bell (1876), Tesla (1880) followed by Marconi and Bose (late 19th century). It is known that the concept of cell phone was produced by Bell Laboratories with the permission of FCC (Federal Communication Commission), and had everything to do with broadcasting and sending a radio message out over the airwaves.
In cell phone technology cells divide the city, allowing for the facility to be frequently reused throughout the city. Millions can simultaneously avail of it.
In devices that are half-duplex (walkie-talkies and CB radios) two communicators use a single frequency. This means that at a single point of time only one can talk. On the other hand a cell phone being a full duplex tool has two frequencies: one for talking and the other for listening. Thus a real-life conversation can take place. Cell phones glide through 1,664 channels whereas the walkie-talkie group has to be content with only 40. The walkie-talkie and the CB radio respectively reaches out to 1 mile and 5 miles but the cell phones, because of their ability to switch from cell to cell can cover incredible distances, even while driving at top speed. Each cell is approximately 10 square miles.
The cells are usually depicted as hexagons. The unique frequency tiers avoid all possibilities of cross connections. Generally a carrier of cell phone can avail of 832 radio frequencies in a city. Each cell phone uses 395 voice channels (per carrier), that is 56 voice channels per cell. It means 56 persons can simultaneously say hello on the phone. In digital transmission technology the number of channels increases even further. For each cell phone 168 channels is available.
The distinctiveness about cell phones is their low-power transmitters. Most use 2 strengths: 0.6 watts and 0.3 watts. In comparison it is 4 watts for CB radios. The advantage of this is that it can be frequently reused consuming less power. Cell phones are battery operated. The lower the power the smaller the battery. This makes the set handy and light.
For cellular technology a city requires a good number of base stations. This can run into some hundreds of towers. But because of the huge number of users costs per head remain very low. Each carrier has one centre called MTSO or Mobile Telephone Switching Office. Its work is to see to all the connections.
Cell phones each have codes, which enable identification of the phone, its user and its server. When someone tries to reach a phone the first thing is to locate the SID (system identification code) on the control channel, that is find out if the phone is within range or not. A message relays no-service when it is out of range. But when the SID is received then the next step is to find out whether the call is within its own home zone or not. The phone also tracks the location of the phone called on a database. Thus the MTSO knows the cell of the called number and caller. Communication is transmitted through the control channel and it is this link that activates the phone being called and calling.
These are the facts of a cell phone as explained for a layman. It is always advisable to know at least the basics of a cell phone since it has become an integral part of our life. This article can be accessed in portuguese from the Article section of page www.polomercantil.com.br/celular.php
Roberto Sedycias works for www.PoloMercantil.com.brsearch engine optimization consulting

Cell phone is a wireless, portable, long-range, electronic telephone, which during travel can seamlessly change antenna connections, from one radio reception cell to another radio reception cell, without dropping or losing the ongoing call.
Besides the standard voice function of a telephone, latest cell phones have features such as SMS for text messages, MMS for multimedia messages, radio, games, internet connectivity for email, browsing, blogging, music (MP3) playback, memo recording, built-in cameras and camcorders, ringtones, personal organizers, Push-to-Talk (PTT), Bluetooth and infrared connectivity, call registers, streaming video, downloading video, video call, and also serve as wireless modems for PCs that can be connected to the Internet.
The power in a cell phone is obtained from rechargeable batteries, which can be recharged from the mains, a USB port or a cigarette lighter port in an automobile. Nickel Metal Hydride were the most common types of batteries, which due to the “memory effect” (the user can recharge only when the entire battery is drained off) were replaced by Lithium-Ion batteries, which did not suffer from any memory effect.
Cell phones came into existence because of the invention of hexagonal cells in 1947, for the base stations by Bell Labs engineers at AT&T. This was further developed during the 1960s by Bell Labs. During a call, the channel frequency could not be changed automatically from one cell (base station coverage area) to another cell (base station coverage area) as the person traveled from the area of one cell to the area of another cell. Amos Joel of Bell Labs invented a breakthrough invention and called it as the `call handoff` by which the channel frequency could be changed automatically from one cell to another cell, during the same call, as the mobile user traveled from one cell to another cell. Due to their heavy construction, these phones were used mainly in automobiles.
The first practical cell phone in a non-vehicle setting, and which could be handheld, was invented by Martin Cooper, the General Manager (Communications Division) of Motorola, who made the world`s first handheld cell phone call on April 3, 1973.
The technology by which the cell phone works depends on the mobile phone operator; however, all of them use electromagnetic radio waves, which are in touch with a cell site (base station). The base station is composed of several antennas which are mounted on a pole, tower, or building. Cell sites are spread at a distance of 5 to 8 miles (approx. 8 to 13 km) from each other. The low power transceiver from the cell phone transmits the voice and data to the nearest cell site. During movement, the cell phone will “handoff” the information to other cell site. Mobile phone operators use many technologies to maintain the smooth stream of digitized data from the cell phone to the cell site and vice versa.
The wireless telephone technologies are grouped under heads known as generations, starting from zero generation or 0G. The current generation going on is 4G; however, there are old cell phones that still operate on 1G, 2G, and 3G technologies. The wireless telephone technologies used in each generation are as given below:
0G: PTT, MTS, IMTS, AMTS, OLT, MTD, Autotel/PALM, ARP
1G: NMT, AMPS/TACS/ETACS, Hicap, CDPD, Mobitex, DataTac
2G: GSM, iDEN, D-AMPS, IS-95/cdmaOne, PDC, CSD, PHS, GPRS, HSCSD, WiDEN, CDMA2000 1xRTT/IS-2000, EDGE (EGPRS)
3G: W-CDMA, UMTS (3GSM), FOMA, TD-CDMA/UMTS-TDD, 1xEV-DO/IS-856, TD-SCDMA, GAN (UMA), HSPA, HSDPA, HSUPA, HSPA+, HSOPA
4G : UMB, UMTS Revision 8 (LTE), WiMAX
Frequency bands: SMR, Cellular, PCS
The impact of cell phone usage on human health has been of considerable worldwide concern. Research studies in Copenhagen, from the Danish Institute of Cancer Epidemiology, the National Cancer Institute, and the Institute of Cancer Research, do not establish any link between cancer and cell phone usage. However, an intergovernmental agency IARC (International Agency for Research on Cancer) forming part of the World Health Organization of the United Nations, undertook a study of 4,500 users and found a statistically significant link between cell phone usage and tumor frequency. Further research is going on.
Cell phone usage and driving is a common worldwide phenomenon. Some jurisdictions have banned usage of hand-held phones during driving, but allowed the hands-free fashion of cell phone usage while driving. However, studies have found out that the distraction is caused by the conversation itself; hence, both hand-held and hands-free cell phones contribute towards road traffic accidents. Further studies on cell phone usage and driving are going on.
Nokia Corporation is currently the world`s largest manufacturer of cell phones. Other notable cell phone manufacturers, in alphabetical order, are 3G, Audiovox (now UT Starcom), Benefon, BenQ-Siemens, Fujitsu, High Tech Computer Corporation (HTC), Kyocera, LG Mobile, Motorola, NEC, Panasonic (Matsushita Electric), Pantech Curitel, Philips, Research In Motion, Sagem, Samsung, Sanyo, Sharp, Siemens, Sierra Wireless, SK Teletech, Sony Ericsson, T&A Alcatel, Toshiba, and Verizon. This article can also be accessed in portuguese language from the News Article section of page www.polomercantil.com.br/celular.php
Roberto Sedycias works as IT consultant for www.PoloMercantil.com.brFree WP Autoposter Plugins