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Remote locking phone without app installed

Today my teacher took my droid razr maxx, and im fine with that i was using it in class.
But this teacher is not to be trusted.I didn't put a lock on my phone. I wont be able to get the phone back until Monday when I go back to school. He is probably using it right now :afraid:.

I don't have any apps installed that remote lock. I found lookout but can only track the phone not remote lock it.

Any help would be appreciated.
 

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