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Prisons: Signal Blocking Devices

Asked by Luke MurphyLabourMinistry of JusticeTabled Answered 23 July 2025UIN 68218

The question

To ask the Secretary of State for Justice, what steps her department is taking to increase the use of phone blocking (a) techniques and (b) technologies in prisons.

Answered by Sir Nicholas Dakin

His Majesty’s Prison & Probation Service (HMPPS) is committed to tackling the threat to prison security posed by illicit mobile telephones. We have a wide-ranging programme in place to prevent them from entering prisons; to detect and disrupt their use by prisoners if they are smuggled in; and to investigate cases where a prisoner may have committed an offence.

As part of their local security strategies, prisons are able to deploy a range of measures to detect items of contraband, including X-ray body scanners, and Enhanced Gate Security that utilises X-ray baggage scanners and metal detection. Owing to security and operational sensitivities, however, it would not be appropriate to comment in detail on the countermeasures HMPPS has in place.

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