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Identify the most important information and less important

These days , I have been considering buying a new mobile phone. First of all, I like the ones with MP3 function in particular, this way, music will accompany me wherever I go. However, a major consideration is the radiation from the mobile phones, So, I prefer one that will do least harm to the user. Certainly, it doesn’t matter so much whether it could be used as a camera, for I think the picture a mobile phone could take is not clear enough and it wastes a large quantity of power.

To buy a satisfied mobile phone, which requirement do you think is the most important and least important?

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