Tommy Robinson refused to hand over his phone pin when police stopped his Bentley on the way to Benidorm, a court has heard.
He allegedly told officers «Not a chance, bruv» and said he was a journalist when they pulled him aside at the Channel Tunnel at Folkestone in July 2024.
Robinson, real name Stephen Yaxley-Lennon, is accused of «frustrating» counter-terrorism powers by refusing to give access to the phone.
He denies the charge.
The right-wing political activist was flanked by security guards as he arrived at Westminster Magistrates Court for the opening of the trial on Monday.
The 42-year-old faces three months in prison and/or a £2,500 fine if found guilty.
Robinson had £13,000 and 1,900 euros on him when he was stopped and told police he was going to Benidorm in Spain for a few days, said prosecutor Jo Morris.
He allegedly refused to give the pin as he claimed the phone had sensitive «journalist material» on it.
He’s said to have told police: «It’s my work, I’m a journalist,» claiming it contained information about «vulnerable girls».
The court heard Robinson was stopped in his silver Bentley SUV because he gave «short, vague replies» about what he was doing and «made no eye contact».
PC Mitchell Thorogood told the court it was also «unusual» he bought tickets on the day rather than in advance and was in an expensive car not registered in his name.
When police took Robinson into an interview room and demanded his phone, he allegedly told them: «Not a chance bruv… you look like a c*** so you ain’t having it.»
Officers said they recognised Robinson when they stopped him and his lawyer, Alisdair Williamson KC, suggested the stop may have been «discriminatory» against his political beliefs.
Police can stop anyone at a UK port and hold them for six hours if they suspect they may be involved in planning or committing acts of terrorism.
They are legally obliged to answer questions and must give access to their electronic devices or face a criminal charge.
In a video on X before the hearing, Robinson said Elon Musk had «picked up the legal bill» for «this absolute state persecution».
The case comes a month after Robinson led a huge rally in central London under the banner ‘Unite the Kingdom’.
The trial continues.