Who called from 2073313201

I got a call during school today but wasn't able to pick up, looking at this I should probably NOT call back, right?

The numbers are "spoofs" that cover for the real call.  These people are calling from out of state.  Sometimes it's "Florida," sometimes "New York."  I've also gotten calls where the caller ID says "Camden."

When you try to call back, you find out it is not a number that is in service.

"not a number that is in service" means the number is spoofed  https://en.wikipedia.org/wiki/Caller_ID_spoofing  and your caller should be treated as hostile.

This was an unwanted call.
Reversed the call and number was not available