Unlocked iPhone became locked after upgrade to iOS6 - what should I do?

I bought an unlocked iPhone at the Montreal Apple store two years ago whie I was on student exchange there.
Since about a year ago I've been using it in Israel with Israeli carrier. Didn't need to jailbreak it or anything, since it was bought unlocked.
However, after upgrade to iOS6 this morning, it became locked and I can't use it again.
Any ideas what to do? Did this happen to anyone else?

You need to contact the Apple retail store in Montreal where the iPhone was purchased.
If you still have the receipt, the receipt should indicate unlocked. 

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