It is a specific offence to use a hand–held phone or similar device, when driving. Most offences will be dealt with by way of 6 penalty points and a £200 Fixed Penalty Notice but if the matter proceeds to a Court hearing, the fine can be as much as £1,000 or £2,500 if you were driving a bus, coach or any heavy goods vehicle.
In some circumstances, for example if use of a phone has caused or contributed to an accident, the Police may prosecute for driving without due care or dangerous driving in order to secure a more severe punishment.