Haha, I was browsing and found this interesting article. Every phone with an
FCC approval number is supposed to be listed here, and you can compare how much radiation different phones transmit (into your brain

!). I believe the radiation output has a lot to do with the strength of a phone's reception, but that's just an educated guess on my part.
Are you willing to trade better reception for a slightly higher radiation exposure? The
FCC says variations in exposure do not necessarily reflect variations in the safety of any phone, so anything I say otherwise is just my personal suspicions. It seems like EVERYTHING causes cancer these days!
Cell phone radiation chart - CNET reviews