A jail inmate from Highpoint Prison near Bury St Edmunds in Suffolk has uploaded a video of himself rapping to YouTube using a banned mobile phone from his cell.
Karl Gardner, who uses the alias 'Charlie Green' details what led up to his life in prison in a two and a half minute post.
The 27-year-old was sentenced for 5 years after pleading guilty to possession of an imitation firearm with intent, making threats to kill, and being in possession of cannabis in Leigh-on-Sea, Essex in August 2017.
A Prison Service spokesperson said his behaviour was "unacceptable" and "anyone found behaving this way can expect to spend significantly longer behind bars."
They say prisons are introducing airport-style scanners, detection dogs, enhanced perimeter searches and phone-blocking technology to increase safety and security.
- Click to watch a report by ITV News Anglia's Russell Hookey