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Cellular Phones : Some Important Basic Features Of A Cell Phone

4. Features

4.1. Camera in mobile phones

Some phones feature a camera that gives them the ability to work as a digital camera. Often (though not always) the camera is also able to shoot video.

The most important characteristics of a camera are:

1. Resolution (measured in mega pixels): Resolution refers to the number of pixels on a display or in a camera sensor (specifically in a digital image). A higher resolution means more pixels and more pixels provide the ability to display more visual information (resulting in greater clarity and more detail).

Resolution does not refer to the physical size of the display, camera sensor or image. For example, two displays with the same resolution can have different physical dimensions. And since there will be more pixels per inch on the smaller one, the image provided by it should be clearer and more detailed (although graphics will be physically smaller).The number of mega pixels is not always a good measurement of the quality of the photos, but if you plan to print pictures, you would generally get higher quality ones out of higher mega pixel cameras.

2. Lens focus type: Lens focus type can be either fixed or automatic

  • Fixed focus: The camera focus is set to a specific distance by the manufacturer and can't be adjusted. Fixed focus digital cameras limit the photo quality and the minimum shooting distance (no close-ups are possible). Basic mobile phones cameras are usually of the fixed-focus type.
  • Auto focus: Auto-focus is a feature of digital cameras that allows them to focus correctly on a subject. It enhances the quality of the photo over fixed-focus cameras and allows for close-ups (or the even closer macro shots).

3. Flash: The flash could be either LED (single or even double) or xenon

  • LED: Bright white LEDs also can be used as flashlights and flashes for mobile phones. Even if they are not as bright as the xenon flash, LEDs are much more compact and require less energy - and also can be used as video light.
  • Xenon: A xenon flash produces an extremely intense full-spectrum white light for a very short duration. Usually, xenon flashes are brighter than the LED flashes found in most camera phones. However they cannot be used as video light and the condenser they use as a power source needs some time to recharge after each shot. The presence of a xenon flash on a mobile phone doesn't necessarily mean a more powerful flash performance. The power of the xenon flash is dependent on the size of the condenser used to power it up.

4. Zoom: Zoom is a feature common among cameras and is used to make the subject appear closer. Zoom can be either digital or optical. Cameras on mobile phones often have a zoom feature as well but most often it is digital zoom.

  • Digital zoom is implemented in one of two ways:Cropping and Stretching
  • Optical: To create that magnification effect cameras use a set of moving optical lenses - hence the name "optical zoom".

Video: Cameras that can work in "video mode" are characterized by the maximum resolution and frame rate (frames per second or fps) of the recorded video.

Macro: Most often this term is use to describe the macro mode of a camera. This mode allows the taking of photos from extremely short distance unlike close-ups, which also need an auto focus lens but are shot from a slightly greater distance.

4.2. Accessing Internet from mobile phones

1. GPRS (General Packet Radio Service):

It is a method of enhancing 2G phones to enable them to send and receive data more rapidly. With a GPRS connection, the phone is "always on" and can transfer data immediately, and at higher speeds: typically 32 - 48 kbps.

An additional benefit is that data can be transferred at the same time as making a voice call. GPRS is now available on most new phones. GPRS is part of a series of technologies that are designed to move 2G networks closer to the performance of 3G networks. The key characteristic of a 3G network is its ability to transfer large amounts of data at high speed (up to 2 Mbps), enabling applications like video calling, video downloads, web browsing, email, etc. By increasing the speed of a 2G network, some of these applications become possible, e.g. web browsing and sending or receiving emails with large attachments. These technologies are called 2.5G and include enhancements to the CSD technology, such as HSCSD and EDGE.

Browsing the Internet using GSM/GPRS phone:

Well, a lot of GSM networks now offer Internet services that can enable one to connect his phone to his pc or laptop. This means using your phone as a modem, you can browse the Internet.

You can do pairing between mobile and computer by using Bluetooth, if Bluetooth not worked properly better to use data cable, which is given with your mobile. In branded mobile, you might have cd within mobile pack like Sony PC suite CD, Nokia suite CD.

First you need to get Internet connection setting on your mobile. These settings can be received by requesting your service provider.

Then install suite software in computer and connect mobile to computer using data cable or Bluetooth, computer will automatically identify mobile presence and you can start working in Internet by clicking connect to Internet option in mobile.

Speed and charges for using Internet depends on the service provider and the plan you are using.

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