The new UK Prisons and Courts Bill will let mobile networks to deploy IMSI catchers outside of prisons to snoop on mobile phone users. The move represents a threat to the privacy of citizens, privacy advocates pointed out. The measure will allow detecting illegal use of mobile devices by prisoners illicitly communicating with people outside of prison walls. The UK police has purchased police this mobile phone snooping technology to track suspects devices and intercept their communications as part of their investigations. The Met Police has reportedly purchased covert communications data capture equipment from a UK firm, the Cellxion.”]
Source: http://securityaffairs.co/wordpress/56730/laws-and-regulations/imsi-catchers-prisons.html