After warning customers that the next firmware update for its iPhone may render unlocked versions of the device unusable, Apple pushed out a new firmware version which does exactly that.
A report from Macworld confirms that running a firmware update on an iPhone unlocked with anySIM will result in the creation of an iBrick. The phone spits out a "SIM card not valid" error when it's rebooted, and you can't gain access to any of the menus or base functions of the phone – even when the original AT&T SIM card is inserted. The update also undoes the jailbreak procedure required to gain access to the iPhone's file system.
The iPhone update installs components that can access the new iTunes wi-fi music store, plus it adds support for TV out and some usability enhancements. If you've soft-unlocked your iPhone, wait a few more days before running the update. As reported on TUAW, the iPhone Dev Team has promised it will release a hack to let you safely update your phone within one week.
