There are literally hundreds of reports of the 1.1.1 upgrade on NON-HACKED iPhones causing the IMEI number to change and bricking the phone.
There are thousands of reports of alien abductions by little green men, too, so does this mean we should take everything we read on the Internet at face value?
I'm not saying it is the case here, but some of these reports clearly are fabrications or half-truths. There are users of iPhones received through intermediaries saying theirs could not have been unlocked simply because they don't personally know what a hack is. Some are third party reports, along the lines of, "This happened to a friend; I know he would never do any hacking like this." Some don't even go that far & simply say they have heard of it happening to unspecified people. Quite a few obviously don't know what "bricked" means & are reporting some other problem with the update. Few refer to the IMEI at all.
Some report only that their phone "is locked," leaving open the question if it was ever unlocked & then re-locked. A few of the most pathetic change the details of their story in different posts, sometimes in the same thread. (They apparently think everyone has short term memory problems or can't use a search function, I guess.)
The possibility that worries me the most is some of these posts may be instigated by people that have a malicious motive to spread fear about applying the update, which fixes some serious security flaws in older phones. It also seems likely that a few Apple bashers or those with an interest in promoting other phones would be willing to make up tales to add to the mix. I have no way to tell if this is a real problem, but it does bother me that some posts are "one hit wonders" -- the alias of the poster is new to a forum, posts one report of the problem, & then never follows up.
The point I'm trying to make is not that some "non-hacked" phones haven't been bricked, but that we have pathetically few ways to realistically estimate the size of the problem, or what Apple is doing about it.
As a user-to-user community, the best we can do here is to post as many details as possible, remembering that we are asking strangers to trust us, & see if we can be part of the solution.