How can i track my iPhone but NOT using Find My iPhone?

I left my phone at school a few days ago and no one has handed it in to the office, and i'm trying to find a way i can track it without Find My iPhone. Because i've been refreshing it daily but it never comes online.

If it doesn't come online, then you're out of luck.

There's no way other than Find My iPhone, unless you installed some other similar app (which isn't likely).

If it isn't coming up that's likely because it may not have actually been found & the battery died.