Researchers say iPhones can track users' movements

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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.

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