Media playback is unsupported on your device

Researchers say iPhones can track users' movements

Apple iPhones and 3G iPads are secretly recording and storing details of all their owners' movements, researchers claim.

Location data is kept in a hidden, unencrypted file according to security experts Alasdair Allan and Pete Warden.

With the right software, it can be used to map exactly where a person has been.

The BBC's technology correspondent Rory Cellan-Jones explains.

  • 21 Apr 2011