I need some clarification on what constitutes "factory unlocked" (as opposed to merely IMEI "unlocked") and whether it's possible to discriminate between the two after the fact. An unlocked iPhone could fall into one of the following groups: 1) No-commitment, contract-free iPhone that has been unlocked at the factory. This would be a true "factory unlocked" iPhone. 2) iPhone unlocked through at&t in which the IMEI is submitted to Apple and Apple unlocks it. 3) iPhone IMEI-unlocked through a third-party such as fusion_unlock or Gevey. Is it possible to discriminate between a true "factory unlocked" iPhone and an iPhone that's been IMEI unlocked through at&t or a third party? If so, how?