I have a AT&T unlocked Lumia 920, but I just sold it on eBay so I reset the phone to delete all my stuff. I wanted to make sure the phone was still unlocked so I did the keycode for unlocking the phone ##7820# which worked before i reset it, now it just shows a blank screen. I just want to make sure the phone is still unlocked before i send it out. The phone does have 13 updates, but I don't really think this effects that. I don't want it to download any of my info to the phone so I don't want to sign into the store.