I own a locked AT&T iPhone 4.
I did jailbreak it to 5.0.1 (untethered) to preserve the 04.10.01 baseband, so I can unlock it with my Gevey.
I hacktivated the iPhone with SAMPrefs.
My Carrier is shown as "Carrier Lab 11.0".
Everything is working perfectly.
BUT, my brand new French...