My works van has a hands free phone kit in it, which obviously makes it totally legal to be on the phone whilst driving, BUT you really do get so distracted whilst in a conversation. This has happened to me a few times you lose all concentration on your driving and focus on your call.
My work has now put a stop to all phone calls whilst driving anyway. Ive never been caught on my phone but I was quite bad for texting until a few weeks ago. Was going down the bypass and was looking at the road, then the text, then the road, then the text, then FUCK!! A tractor had pulled off a slip road and was doing about 20mph, I was doing 70! Nearly in the back of him after looking away for a split second. Shit me up that so it did, so my texting whilst driving has now stopped