Videos of a heroin dealer boasting about his fun life in jail were broadcast live using a mobile phone from inside Rochester prison.

The footage, posted by Cleon Davis, shows the 20-year-old rapping, hanging out with friends, showing off his clothes, and taking part in a “bag and tag” prank where another inmate was bundled into a green wash bag and dumped in a cubicle.

In one clip he said: “The man is living good, trust me. Jail is fun.”

VIDEO: Heroin dealer broadcasts live from prison.

The prison service has started an investigation into the incident.

Davis, from Camberwell, was jailed in June for three years and nine months after admitting conspiring to supply heroin and possession with intent to supply crack cocaine according to The Evening Standard.

The videos are no longer available to view on Periscope but Davis’ twitter account is still active.

The account shows he has been tweeting from jail for several months but only starting streaming the videos on Periscope this month.

It is a criminal offence to bring a mobile phone into a prison, or transmit from within prison using one - these offences carry a maximum of two years in prison.

To try to tackle the problem, the prison service uses body scanners, high sensitivity metal detecting wands and intelligence-led searches.

A spokesman said: “This is totally unacceptable behaviour. As soon as this information was shared with us, we immediately conducted a search of this offender’s cell and reported him to police for investigation.

“We do not tolerate the use of social media by prisoners and have urged Twitter to shut down the account in question as soon as possible.

“There are measures in place to detect mobile phone but more needs to be done, which is why the Justice Secretary has asked us to look at how we can ensure the right tools are in place to tackle this problem.”

Legislation has been introduced to allow prisons to use signal-denying technology to suppress the use of wireless telegraphy such as mobile phones by prisoners.

Further laws are being brought which will allow court orders to be used to compel mobile network operators to disconnect illicit mobile phones being used in a prison.