A LAG who was caught with a phone up his rear end claimed the blower didn’t belong to him.

The four-inch mobile was discovered up Dylan Martin’s bum after suspicious screws picked up a signal and searched his cell at HMP Bullingdon, near Bicester in Oxfordshire.

2 A prisoner found with a phone up his bottom claimed the mobile wasn't his

Despite looking shocked and adamantly telling the guards the device had nothing to do with him, Martin had an extra half a year tacked on to the end of his sentence.

His excuse crumbled after guards discovered the SIM card inside the phone had his family and friends as contacts.

Martin was given extra jail time at Oxford Crown Court after admitting he had a mobile phone in prison without permission, the Oxford Mail reports.

The court heard the jail’s mobile phone detection equipment picked up a signal coming from his cell on 4 August this year.

2 Dylan Martin's excuse fell apart after the SIM card inside the Samsung phone was discovered to have his family's details on Credit: Getty - Contributor

When guards searched, he owned up to having the Samsung phone but insisted it was not his.

Defence barrister Vida Simpeh said he’d made good progress while in prison, going on several rehabilitation courses, and was gearing up for his release in April 2019.

But Judge Ian Pringle said: “You knew full well that was not permitted. ‘It is a scourge on our prisons up and down the country the possession of mobile phones, and you deserve punishment for that.

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“However, you also deserve credit for the plea of guilty you have entered and I note you have completed various courses and you are preparing for release.

“I am afraid that release will be a little bit delayed.”

He was jailed for six months to be served consecutive to his current sentence.