Is Camera and Mp3 is essential for mobile phones?

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The most of the mobile phones are now aomes with camera and mp3 support. Is theae are necessary for the mobile phones? Some people like it and some are not like this. Mainly in India aged people not like the camera phones. They use a normal phone. But the youngsters are mostly used the camera and mp3 supported mobile phones. they spend 7000 and more for a mobile phone. What is your opinion about this?