Penalties for using a phone while driving has also been doubled in England, Scotland and Wales from today to six points and a fine of 200 pounds.
New drivers who get six points or more must retake their practical and theory. More experienced drivers can be banned if they get 12 points in three years.
The tougher punishments come alongside a hard-hitting advertising campaign, the BBC reported.
In 2015 - the latest year for which figures are available - 22 people were killed and 99 seriously injured in accidents where a driver was using their phone.
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About 3,600 drivers were handed penalties in the last co-ordinated enforcement week from January 23-29, the Department for Transport said.
Advertisements aimed at discouraging phone use have been developed by the government's road safety group Think! and the AA Charitable Trust, and will be shown at cinemas and on billboards, radio and social media.
British Transport Secretary Chris Grayling said: "It may seem innocent, but holding and using your phone at the wheel risks serious injury and even death to yourself and other road users.
Calls to prevent drivers using phones intensified last year in the wake of several high-profile cases and research indicating that it was widespread.
Edmund King, president of the AA, said too many drivers were addicted to their phones.
"We need to break this addiction and the best way is for drivers to go cold turkey - turn off the phone and put it in the glove box."
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