Made in China and sold on eBay or Amazon for $60 to $80, the small devices resemble car key fobs and are coming with very low metal content which could allow them to be easily smuggled into prisons past metal detectors. In 2012, UK authorities seized over 7,000 phones and SIM cards from prisons in England and Wales, and they don't want more of the small phones to reach the hands of inmates and are therefore planning to bring about a sales ban.