Apple iPhone warning proves true

An Apple software update is disabling iPhones that have been unlocked by owners who wanted to choose which mobile network to use.

Earlier this week Apple said a planned update would leave the device "permanently inoperable".

Thousands of iPhone owners hacked their expensive gadget in order to unlock it for use with other mobile carriers and to run a host of unsupported programs.

There are also reports of the update causing issues with unaltered iPhones.

On Monday Apple issued a statement in which it said many of the unauthorised iPhone unlocking programs caused "irreparable damage" to the device's software.