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.
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