A special report by the US-based Insurance Institute for Highway Safety suggests that up to 22 percent of all accidents there could be attributed to the use of a phone while driving.
Overall, 40 percent of drivers in the survey said they had used their phones at least a few times while driving in the previous week, and one in five talk on the phone while driving every day.
Some 13 percent of drivers admitted to texting while driving.
The report is comprehensive, and can be accessed here.