Are Mobile Phones Dangerous?

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Not too long ago I had a discussion with one of my friends about the dangers of mobile phones. He spends alot of time on his phone daily speaking to his girlfriend and is concerned with pain on the right side of his head, concluding that its from mobile usage. Can cell phones really cause cancer? There is nothing certain about its dangers but its safe to assume that it can be a potential risk and people should take the right precautions. VIDEO->

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