are cell phones harmfull?

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yeah! cell phones r harmfull as : 1) firstly, if we are putting the phone on the right ear and talking the vibrations sent by the electronic device directly affects our brains. so i suggest less use.. and comparatively using the cell phone from the right ear as if does not affect our brain directly. 2)it wastes alot of time. sometimes u become so addicted to the phone that u even forget ur studies on the exam times and we just talk and talk on the phone. it affects studies too so i suggest less use of cell dphones.. i need ur responses for this plz.....