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"I hope you're talking to me on a speakerphone," Devra Davis barks at me when I call her on my cell phone. "You'd better not be holding that phone up to your head."

Indeed, I'm not. This is a good thing, because you don't want to get into an argument with Davis on this subject. She's the director of the University of Pittsburgh's Center for Environmental Oncology, and her group recently put out recommendations that we should be using a speakerphone or ear piece. The report says children, who have thinner skulls and developing brains, should use cell phones only in case of emergency.

And heaven forbid anyone should carry a cell phone in a pocket or clipped to a belt. "You're just roasting your bone marrow," Davis said.

Oh, boy. Another thing to worry about. Or maybe Davis is an alarmist. It's so hard to tell. Although there are many large studies showing no connection between mobile phones and cancer, there are a few that do. As Davis puts it, do you really want to play Russian roulette with your head? Explainer: Radiation fields and the brain

But if you do buy the cellphones-cause-cancer argument, you have to figure out the best way to talk on a cell phone, seeing as how most of us can't live without them. Should you use the wired headset that came with your phone? A Bluetooth earpiece? iReport.com: Does your kid have a cell phone? Read full article »

CNN's John Bonifield and Jennifer Pifer contributed to this report.

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