My iPhone 6S plus which was running iOS 9.2.1 got stolen on Saturday night. It was protected by fingerprint security as well as a 6 digit pass code. I instantly activated lost mode and tried to find my iPhone but the thief switched it off. Till today, the iPhone showed the last known location which is where i lost it. After that the thief briefly switched it on for a minute and the location changed. Today, i notice that the device is not on my list of apple devices on my iCloud account. I really can't figure out how the thief could have bypassed so many layers of security i.e Fingerprint, 6 digit passcode, lost mode, activation lock. If the device is not listed anymore in my iCloud account, i am assuming it is because he was able to factory restore it. Can anyone please explain to me how it is that he was able to do inspite of so many layers of security.