Phone unlocks have expired :(
As expected, per our announcement in June, all Windows Phone developer unlocks via the Chevron Labs service expired August 11, 2012. If your phone is currently unlocked via the Chevron Labs service, your device will relock itself at next sync with the Zune desktop software. If you moved to a paid App Hub account, you may need to re-unlock the device using the Developer Registration tool.
An updated refund status post should be up tomorrow, we’re just crunching the numbers we received from Microsoft. Thanks a lot for your patience folks!
— Rafael Rivera