In a complete turn-around from iOS 5 beta 1, Apple has blocked the SIM in iOS 5 beta 2. This was recently tested and announced by the iPhone hacker MuscleNerd. If you remember correctly, the Gevey SIM adapter unlocked the iPhone by calling the number 112 emergency number.

It's suprising that Apple would do this in a beta since this shows Gevey how they are blocking the use of the SIM adapter, therefore, giving them the opportunity to create a work around. But it may be possible that Apple has several different blocks they could use and are throwing Gevey off the trail of which one they'll ultimately use in the final release of iOS 5. In the meantime, Gevey will probably not worry about creating a workaround and will wait for final release.