FusionOne and VeriSign do it as a back-up service for Verizon Wireless and Cincinnati Bell , but so far their lockers are limited to storing address books.
Bell Labs' math and physics experts are devising algorithms to speed up the service's back-end computation so all this video can be rendered on the fly.
He said that, in some emergencies - such as the M5 motorway crash near Taunton, Somerset, in November 2011 - it was easier for NHS patient transport staff and vehicles to backup 999 crews than a service run by a different company.