No, I think that the hand-held bit is really bad. I can spot a mobile phone user when I am behind them as they are drifting uncontrollably about, especially when they are dialling the number - a point which is often overlooked and is just as bad with hands-free of course.
Texting? More like tweeting etc. I often look in my mirror to see people slowing down to take photos on their phones, presumably to tweet. I am convinced that all the queues caused by rubber-necking at accidents on the other carriageway of motorways is largely a result of people taking pics to tweet/fb. Sad or what?
I would say about half to two thirds of drivers suddenly start looking at their laps when slowing down in queues - presumably playing with their damn phones. Another aspect that is bad is that devices are all touch-screen now so there is no alternative other than to look directly at them to operate them (no tactile feedback as you would get from real keyboards).
Something needs to be done as I reckon this is the major cause of all the shunts and smidsys we see today; I doubt anything will/can be done though, sadly.