Lot of people say usage of cell phone is not good for health

Thats a real fact. Radiation of any sort is not good for health. And cell phones release too much radiation. Radiation damages the genes in your body and gives rise to defects. Over use of cellphones should be therefore be avoided.

I think that as of now, there is still no reported evidence of mobile phones harming people through the frequency, as it is set to be a tolerable one. It's like an uber-weak xray frequency of sorts that will not harm people, although there is a report that mobile phones explodes...Have a nice day.

I just heard during your call the cell phone getting warmer and this could have impact on your brain. But the impact is really insignificant. I think you could call for ages and there will be probably still no big impact on you. If it would he too harmful or dangerous there would surely be some serious news or researches done by respected authorities on this issue. Maybe this is just marketing trick of fixed line operators who are trying to increase their fix line service which suffers badly form mobile phones.