I guess we can agree about the fact that cell phones DO radiate. How much is another question.
But, as this article shows, you can do a LOT about how much of this radiation gets to you and not elsewhere
http://www.nytimes.com/2011/03/31/technology/personaltech/31basics.html
So, I would say, bluetooth headsets are a great way to get around exposing yourself to too much of it, and not making so many calls via cell phone another
What's wrong with taking a call, and calling back from your home or bureau phone? I do that all the time. You don't do callers justice when you talk to them on the go, and all the people around you in bars, restaurants, buses, the street don't enjoy you having that calls in their presence.
And don't let me start about calling or texting in your car. That is madness.