UK asks Amazon and eBay to ban tiny ‘prison’ phones
 

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....

https://www.engadget.com/2017/12/18/...n-phone-sales/