I've had my iPhone for 2 years, and this has never happened before. I turned airplane mode off and my phone screen turned white with the apple logo and had a loading bar underneath it. Once it reloaded, it informed me that everything was erased off of my phone.
Now it won't let me use the Apple ID log in. It states that the owner used 'find my iPhone' to erase everything.
I have never used 'Find my iPhone'. What is happening here?