An extremist with links to hate preacher Anjem Choudary has had a mobile phone seized from him in Altcourse prison after fears he was radicalising other inmates.
Rajib Khan, 38, was one of a group of men jailed in February after an undercover police operation found they were drumming up support for Islamic State.
He is now serving a five-year sentence in HMP Altcourse, Fazakerley.
A spokesman for the prison, which is run by security firm G4S, said a mobile phone was found by officers and concerns were raised over radicalisation.
The spokesman said: “Our team seized a mobile phone from this prisoner in early May and it was immediately passed to the police.
“The prisoner’s regime was restricted and he was placed in a single cell.
“Where we suspect men might be spreading hatred or radicalising others, we will always act swiftly and refer any evidence or intelligence to the police and security services.”
Khan was brought to justice after an undercover police officer infiltrated the Luton chapter of the banned group Al-Muhajiroun (ALM) and secretly recorded speeches over 20 months.
At the meetings, attended by up to 80 people including young children, the group praised IS and urged people to support the terror group and travel to Syria to fight.
Khan was described as an “important and influential” member of the group, who had hailed the Charlie Hebdo atrocity in Paris as “excellent news”.