Just had my iPhone replaced by iPhone. It was unlocked by AT&T prior to having it replaced. I called AT&T with my new IMEI number and they confirmed that the iPhone just given to me by Apple is unlocked. So if you bring an unlocked iPhone to Apple and they replace it, it's also unlocked? The genius that replaced my iPhone said I would need to request an unlock from AT&T, but I wanted to be sure before doing so. Also I checked the warranty on my replacement iPhone and it's one year from today. I was happily surprised. Is this a known fact too?