I Need a New Cell Phone

I have a 3G Samsung cell phone since March 2005. When I bought this phone it was one of the best products in the store. It cost me around three hundred Euros, which I paid in one year.
This Samsung has the best technology in the market. It includes a camera that captures photos and small videos, Internet connection and everything else a normal cell phone has.
Four years passed and only now I started having problems with this cell phone. The battery is going crazy and when I talk for more than five minutes the phone gets too hot, which is strange and frightening. I´m not sure if cell phone radiation is safe or what it causes in our brain. I need to read more research about this topic.
I´m considering buying a new cell phone but I´m not sure which brand to choose. One thing I´m sure, I will buy a cheaper phone with less technology. Maybe a cheaper phone will last more than a top line like I have.
Which is your favorite cell phone brand, and why?