Mobile phones - A threat or a boon?

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I am all for using mobile phones, for our personal communication and for emergency purposes. However, I see that their usage rate has gone up by a tremendous and alarming level, which has forced families to possess even three to five mobile phones at the least. Over use of phones are causing irreversible damage to the ears and the brain. Even I am seeing kids having phones, which they use without restriction. their use is seen everywhere, causing disturbance to everyone in the vicinity. Is this a healthy trend? How does it seem to be a boon when it also has so many demerits that cannot be justified?