The one-day blitz took place throughout Lothian and Borders on Monday as part of the Mobile Phone Day Of Action.
As well as the 20 drivers caught using mobiles, officers also found 61 motorists failing to wear a seatbelt.
Advertisement
Hide AdAdvertisement
Hide AdChief Superintendent Charlie Common said: "On the day after which we celebrated excellent provisional casualty figures for Scottish roads, it is disappointing to again find such widespread disregard of legislation which is designed to safeguard drivers and passengers."