Someone has stolen my iPhone at school, what do I do?

I don't have the FIND MY IPHONE thing turned on so i can't track it. Is there any other way i can track my iphone

You can't track it, but if you tell someone at the school, like a dean, they will definitely get with the SRO and get it back for you. That happened to my brother.

Unfortunately no, the best you can do is to call your carrier to deactivate your SIM and do a IMEI block on the iPhone so the person who stole your iPhone ends up with a heavy iPod Touch.