answer:Some folks might challenge me on this opinion, but I think the jury’s still out on high radio frequency exposure and cancer; I’m quite paranoid of things resonating at that high a frequency close to my brain cells for prolonged periods of time. My answer based on that assertion is to look into wired earphones. I happen to be an iPhone owner and use some pretty nice sounding stereo earphones that have the combination in-line microphone on the wire; I simply plug them in before driving and when a call comes in, pick up the earbud and press the answer button. Works for me and also saves the hassle of charging a Bluetooth all the time.