Occasionally I'll use the cellphone while driving - usually just if someone calls me (which is very rarely). Doing so can be dangerous if you're not careful, and I understand that, but I think texting while driving is MUCH more dangerous than using the cell phone to make a regular call.
If you're just making a call, you can keep your eyes on the road (if you can't keep your attention there too, then you need to pull over). If you're texting, you have to keep glancing down (or over, or whatever) at your phone and that is, IMHO, much deadlier.