Android phones in a freezer for an hour until the device had cooled to below -10C.
The trio discovered that quickly connecting and disconnecting the battery of a frozen phone forced the handset into a vulnerable mode. This loophole let them start it up with some custom-built software rather than its onboard Android operating system. The researchers dubbed their custom code Frost - Forensic Recovery of Scrambled Telephones.
The Frost software helped them copy data on a phone that could then be analysed on a separate computer.
BBC News - Frozen Android phones give up data secrets
