Two drivers face six points on their licence and a £200 fine after failing to spot a marked police patrol car.
The man behind the wheel of a white 4x4 didn't realise PC Rod Morrison was behind him as he turned of the A10 onto Bridge Road, in Hilgay.
Shortly afterwards, the driver of a silver VW Passat was pulled over on the nearby A10.
'Another driver using mobile phone whilst driving and in a vehicle not taxed since August 2016,' tweeted PC Morrison. 'Driver dealt with for the offences.'
The offences come weeks after more than 120 people were caught driving while using a mobile phone in Norfolk during a week-long enforcement campaign.
Operation Ringtone ran between Monday, January 22 and Sunday, January 28.
Chief Insp Kris Barnard, Head of the Norfolk and Suffolk joint roads policing and firearms operations unit, said: 'This is a staggering number of people caught breaking the law - an average of 17 a day.'
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