Someone stole my iPhone yesterday and Find my iPhone was on. We were tracking the place and then they might have turned the phone off because it appeared offline. Today I couldn't find my device on Find my iPhone. I was using two phones with the same Apple ID, and I can only see one phone now.
What does this mean? Did they just erase my phone and set up as a new phone? I blocked IMEI number and it was passcode protected as well.