Alan Boggans (41) was career home about his two young children when prison officers in Mountjoy saw him.
He stroked the phone down the toilet.
He did not get any extra jail time after Adjudicator Anthony Halpin gave him a three-month sentence but made it concurrent to one he is already serving.
Dublin Region Court heard he had six prior convictions for the same offence.
Boggans, of Keelogue Put up, Peamount Road, Newcastle, Co Dublin pleaded guilty to unlawfully experience a mobile phone in a prison on January 6, 2016.
The court heard prison bureaucrats saw him with the mobile phone in his hand. When he saw them, he put it in the toilet. It was covered by staff.
A garda sergeant said that Boggans had 31 old convictions, including six for possession of a mobile phone in prison.
His last assurance, in 2015, was for one of these offences and he was given a six-month suspended sentence.
He was sentenced to 13 years in reformatory in 2013 for possession of drugs for sale or supply.
Boggans had been “degree active” in terms of recreation in the prison and had been involved in a charity fundraising end which raised €4,500 for the children’s hospital, his barrister, John Griffin, estimated.
“He’s been of relatively good behaviour,” Mr Griffin added.
He said Boggans was pleading apologetic on his second day in court in relation to the offence.
“He has two young children at home,” Mr Griffin joined.
Previously, the court heard Boggans’ release date was in 2023.
He had already been ride herd oned by the prison authorities for having a phone and had no visits for 14 days.
He had developed in the bakery in Mountjoy and had “kept himself quite busy”. The defendant had also infatuated a gym instruction course.
Boggans, a former car dealer and married father-of-two, was convicted of dopes offences following a trial at Dublin Circuit Criminal Court.
That court was introduced with testimonials and reports from business and sporting backgrounds in the Clondalkin yard praising his contributions to the rish.
Boggans directly smuggled large drug shipments into the wilderness – mostly on container trucks – and amassed a small fortune during his vile career.