Apple Inc. has issued a software update that creates problems for iPhones modified to work with a cellular carrier other than AT&T Inc.
Apple warned earlier this week that the iPhone update which adds access to the iTunes Wi-Fi Music Store and fixes some security flaws could permanently disable phones running programs that untether phones from its exclusive partner's network.
Several gadget enthusiast Web sites, including Gizmodo and Engadget, as well as online postings from hacker communities reported that, depending on which unlocking program was used, certain modified phones no longer worked after they installed Thursday's software update. In some cases, the phones worked, but only with the original SIM card that ties the phone to...