Police in Derbyshire have started a month-long campaign to target drivers using mobile phones.
Drivers can be fined £60 and given three points on their licence
Drivers are being warned they face a £60 fine and three penalty points on their licence if they are found using a mobile phone while driving.
They also face a prison sentence if they are then involved in an accident.
Last year, a total of 1,800 drivers were caught and fined in Derbyshire for illegally using a phone whist driving, a police spokesman said.
Ch Insp Simon Kennedy, head of Derbyshire's road policing unit, said: "National research has shown that reaction times for drivers using a hand-held phone were nearly 50% worse than when driving under normal conditions."