I put my cell phone on speaker and
hold it near my chin/mouth if that is what you are referring to. For some reason i feel like it distracts me less while driving. Maybe i feel like its easier to just drop the phone and grab the wheel. Also more comfortable than having my hand stuck to the side of my head.

As far as why I don't use blue tooth or a headset. Crappy excuse but i find them uncomfortable.

I dislike nextel.