Justice secretary David Lidington has called on Amazon, eBay and Gumtree to block all sales of miniature mobile phones. These tiny handsets, often less than eight centimetres long, can be bought for £25 online and easily smuggled into prisons. Many are advertised with the slogan "Beat the BOSS," a reference to the Body Orifice Security Scanners (BOSS) used by prison officers to detect knives, firearm components and other small metallic objects. During a speech for the British think tank Reform, Lidington said he had written to all three asking them to take down products clearly intended to "evade detection measures in prison."

"It's pretty clear to me that these miniature phones are being manufactured and sold with the purpose of being smuggled into prisons," he said. "Why after all are they also advertised as being without any metal components?" Lidington said everyone, including retailers, had an interest in tackling organised crime. Miniature phones can be sold for up to £500 in prison, forcing desperate inmates into a lifetime of crippling debt.