should ask that, what is a megapixel? know that the more the better digital camera photos and can print photos get larger, but what is that?. At first define what a pixel is the smallest unit of color that is part of a digital image or picture that is also an image.
to notice these points or pictures with more detail than we zoom in a picture, then noticed that each image is formed by thousands and thousands of these boxes. Thus, one pixel equals one byte (or 8 bits) and can be coded to make 256 changes in the color depth of what's the point? that in this way work is like most TV screens monitors, adding the main function of color as RGB (red-green-blue or red, green and blue) where mixtures of the 3 are in different shades of color and brightness we see in these devices.
So, one megapixel is the unit equivalent to 1 million pixels, although the measures used in computing prefer to use the 1024 number for your preference in the use of the binary system and is also used to express the resolution of images obtained by digital cameras. For example, an image with resolution of 2048 x 1536 pixels, equivalent to 3.1 megapixels (using the following equation: 2048 x 1536 = 3,145,728).
Examples of good digital cameras in cell phones:
Sony Ericsson W995 : The challenge of this company for the new age of 8 MP, for those who want a Sony Cybershot and telephone simultaneously. 
Nokia N86: The N82 successor. 
Samsung M8800: A new touchscreen 8MP camera Samsung 
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