Well, read the thread. Dunno if it's a fake but a guy with an AT&T locked phone just got lucky on page 20 (EDIT: on page 21-23 a few more guys got lucky already, including a guy from France lol).
Yes an AT&T iPhone just got unlocked for free by the O2 live chat.
In the end, it's just a matter of adding your IMEI number to the Apple database (which is what all this people asking for $170+ is doing anyway), and there's really no way of automagically determining which IMEI came from which carrier IINM, unless that particular carrier keeps a list - and the customer service consultant ACTUALLY refers to that list.
And if O2 can add your IMEI to the Apple unlock database simply like that, bullshitting them might not be impossible after all.
Hence the fact that some of the guys at MMI was successful (got malas CS reps who didn't check the list, or even bother to ask about where the iPhone was from), while others failed (got rajin CS reps who immediately asked where you bought your phone from, what's your O2 PAYG number, etc).
It all depends on your luck and how well you bullshit.
At least for today, before O2 management wises up and tells ALL CS REPS to check the damned list lol.
And even though the "UNLOCKED" phones might just get re-locked, you will have had a few hours to get your SHSH blobs saved so that you can downgrade to something safer. Or something - I'm not much of an unlock person.
How to add? I'm new iphone user.