When I have had to be out on a bike at the same time that I can't miss a call, which yeah does happen, I set my Razr to the 'vibrate like a biotch' mode, slip it in a little ziplock bag that my cycling computer can in, and slide it in under my bike shorts so that it sits wedged in place on the top of my thigh. Once my leg gets a little sweaty it might as well be glued into place. I can pull over take my call and then head back home to meet up the cable guy or to take over with the kids if the wife has been called in.
But for taking a call while in motion, pass. One thing that daily commuting has taught me time and again, whenever you tempt the cycling gods they are more than happy to oblige.
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