2.2 Update Re-Locking Unlocked iPhones

A new issue with the 2.2 software may cause some trouble for people with legitimately unlocked iPhone 3Gs. A few users in an Apple Discussions forum thread are claiming that the iPhones some of them purchased in an unlocked state are being re-locked by the 2.2 update.

"Bought legally unlocked iPhone in Hong Kong. Updated to 2.2 in Germany. No my iPhone seems to be locked.”
“I bought my iPhone 3G legally unlocked from HK, and I just upgraded to iPhone 2.2, but it seems my phone is locked now. On the phone it says emergency calls only and iTunes is saying not supported SIM.”

The issue doesn't appear to be affecting all users with pre-unlocked iPhones, but so far no fix for the problem is known.

[via iPhone Atlas]