Users are reporting that a new update to Apple Inc.'s iPhone is making previously unlocked iPhones unusable.
The iPhone 1.1.1 update, released Thursday, breaks phones that have been hacked so that they work with providers other than AT&T Inc., the only U.S. provider Apple has allowed to carry its mobile phones.
In recent months, a number of software tools have been developed which allow iPhone users to break free of Apple's AT&T-only restriction, but Apple has said that it would fight any attempts to unlock the iPhone. Earlier this week the company released a warning that unlocked iPhones "will likely result in the modified iPhone becoming permanently inoperable when a future Apple-supplied iPhone software update is installed."
Read more: Firmware Update Breaks Hacked iPhones