Cell phones or cellular phones are so called as they cover compartmentalized, cell like areas. The origin of the Cell phone can be traced back to the year 1973 when Motorola came up with World`s first cellular portable telephone which was commercialised as Motorola DynaTAC 8000X.

These days, new cell phones are being added at a rapid pace. The parts of them typically consist of following: circuit board; antenna; keyboard; LCD - liquid crystal display; battery; microphone; speaker.

In recent times, they are available with a wide range of functions. To list a few functions, depending on the type of cell phone you choose: store contact information; keep track of appointments; set reminders; prepare to-do lists; send/receive e-mail; play games; send text messages (sms); access to internet; watch and enjoy TV; built-in calculator; integration with other devices like GPS receivers, MP3 players, etc.

Cell phones, operating on radio frequency, have come up with an innovative cellular approach to counter limited availability of RF spectrum. Now, several cell phone towers are used to cater to a large geographic area.

Each tower (base station), covers a circular area called a cell. A large region is split into a number of cells allowing different base stations to use the same channels/frequencies for communication. This enables thousands and thousands of mobile telephone users to share far fewer channels.

Another important aspect is that, phones need less power to transmit to reach any base station as each base station covers a smaller area. Reducing the required transmit power reduces the size of the battery and thereby the weight of the phone. This has led to miniaturization of cell phones which would not have been possible without the cellular technology.

When you use your cell phone, following things happen. First the phone locates base station having strongest signal, and requests for a channel assignment. The base station permits channel assignment and the call gets accepted. The call is then forwarded to the local telephone network if it is to a regular phone otherwise it is transmitted through the cellular network. The call is then sent to its destination through the telephone network.

When the cell phone is switched on, SID (System Identification Code) on the control channel compares it to the SID programmed into the phone. If the SIDs match, the phone understands that the cell is communicating with home system. The phone sends a registration request, along with the SID and the MTSO keeps track of the phone`s location in a database. If the SID on the control channel does not match the SID of your phone, then the phone is in roaming.

The three technologies commonly used by 2G cell phone networks for transmitting information: frequency division multiple access (FDMA); time division multiple access (TDMA); code division multiple access (CDMA).

GSM (Global System for Mobile communications) implements TDMA, to connect to the specific service providers in different countries. GSM uses subscriber identification module (SIM). SIM stores all the connection data/identification numbers needed to access a particular wireless service provider.

Standard 2.5G protocols used widely are GPRS, EDGE to name a few. Some latest 3G protocols are: Universal Mobile Telecommunication Service (UMTS); Wideband Code-Division Multiple Access (WCDMA); High-Speed Downlink Packet Access (HSDPA); Evolution Data Maximized (EVDO).

A few popular cell phone models in the market have been offered by Nokia, Ericsson, Motorola, Samsung, LG, etc. with each model with its own range of collections.The year 2008 may be a high watermark in the cell phone history with Nokia N-Gage 2, HTC Dream, Apple iPhone 2, BlackBerry Touchscreen, Sony PlayStation Phone which are expected to be launched.

By: Roberto Sedycias

]]> http://cachroniccare.com/unlock-cell-phones/working-of-cell-phones/feed 0 http://cachroniccare.com/unlock-cell-phones/i-phone-u-phone-everybody-wants-a-new-phone http://cachroniccare.com/unlock-cell-phones/i-phone-u-phone-everybody-wants-a-new-phone#comments Tue, 27 Oct 2009 07:42:26 +0000 admin http://cachroniccare.com/?p=21 If you are cell phone savvy or keep up with the latest cell phones, you are not alone. An article this morning, June 1, 2008 in the New York Times is raving about the Son of iPhone due to be unveiled on June 9th in the U.S. This new phone is supposed to have quicker internet access and text messaging capabilities. If that isn't enough, they will be offering face-to-face video. I'm sorry, but sometimes when I'm on my cell phone, I don't want anyone to know what I look like; especially not a potential client. That would certainly kill the deal. There is even talk of a include solar panel strips behind the screen that will charge the phone the more you use it.

This is a far cry from the cell phone in a box that you had to carry around like a briefcase. I'd like to know what's next; a cell phone that you can swipe and checkout at the grocery store, or what about one that can offer discounted gas if used at a pump; now that would make me stand in line overnight waiting for it's debut.

My biggest question is, what about the original iPhone. I am sure that everyone who waited patiently for the first one to come out will undoubtedly be waiting for this one too. Will there now be a rash of original iPhones on eBay for sale?

With cell phones being used more and more for business, and in fact often times contains ones entire office; it's not surprising that every maker wants to improve their options and create the bigger, the better, and the best phone ever. It is quite amazing that a business owner can pull up an invoice, review it, and even pay you right from their phone. I certainly have no complaints if I'm the recipient.

Even Google is jumping on the cell phone craze. Word has it that Google has been mapping out wifi hot spots and cell phone towers in an effort to offer more accurate directions for GPS. This new Google powered cell phone has a locking mechanism where you unlock it by drawing a particular shape. There is also a zoom in device to view the screen easier.

I personally think that Google should stick to what they do best, but, that's just my opinion. They certainly have the funds to create a winner, but if I had my choice of a Google phone or a Blackberry, I think I'd stick to what I know.

Perhaps, that's why I am toting around a Motorola i880; not a shabby phone by any means, but I personally can't see spending hundreds of dollars on a cell phone that may or may not go out of style next week. If I can open it dial a number and reach a person, that works for me and my phone is serving its purpose. Of course, I'm not a big time executive who's on the run all the time and needs to access specific information in an instant. Perhaps one day I will be there, but for today, my phone services me well.

By: Kimberly Best

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