I have done in the past,until I nearly rear ended someone,,just a simple yup,or, OK,sent off in reply,but the near miss woke me up,,but in saying that,many people I know have had a close call,and still do it..Nothing like following a car thats weaving all over the road,the driver is either drunk or texting,nowadays they seem to be texting,or talking.I always pull over now to answer the phone,or if my wife is with me,she answers it.
New Zealand government has finally passed a law prohibiting the use ofcellphones while driving,but doesnt come into effect for a few months yet,,meanwhile the carnage will go on..I just dont want to be on the receiving end of it.