This is so sad, just a pure indication that there is no honest individual in the country, everybody is a suspect. I had my experience back then in undergraduate and definitely understand the pain of losing one’s gadget. Since it was your class that was having test the whole class should be made to contribute and buy back her phone. Tracking of phones do not often yield positive, I have been tracking one for two years now until I eventually gave up. Next time it’s preferable to go to class with a small phone and not android or it’s counterparts