Reports the BBC; "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". The company said this would "likely result in the modified iPhone becoming permanently inoperable when a future Apple-supplied iPhone software update is installed".
That warning has now proved correct as many owners are reporting their phones no longer work following installation of the update.
Apple requires iPhone owners to take out a lengthy contract with AT&T in the United States but there are a number of programs on the net that unlock the device for use with other networks.
Some owners are reporting on technology blogs and Apple's own forums that the update is deleting contacts information, as well as photos and music, on iPhones that have not been modified in any way."