Tommy Robinson, 38, whose real name is Stephen Yaxley-Lennon, is on trial for charges under the terrorism act.
According to Westminster Magistrates' Court, when police asked Robinson for his mobile pin at the Channel Tunnel, he replied "not a chance bruv".
He said he would not give up his phone's pin because it had "journalistic material" on it.
Robinson is standing trial after being charged under the terrorism act.
Author's summary: Tommy Robinson refuses to give police his mobile pin.