The iPhone Dev Team has sorted how to unlock the latest firmware Apple has seeded to developers (240d), just a few days after it was released.

Quote:

Due to gray’s initial RCE of the baseband, and combined with a neutered bootloader, unlocking recent and future basebands has been reduced to a simple byte search.

Thanks to http://www.modmyifone.com for the news.

http://www.modmyifone.com/forums/showthread.php?t=116071