Finding who owns a cell phone number

i have this cell phone number who keeps harassing me. i know people from 4chan and whatnot find out all the time peoples addresses and stuff. i just want to find out who’s calling me.
Answer #1
http://www.cellphoneregistry.com/?hop=htdtinc
Answer #2
$39.95
One Time Billing
no thanks. sorry but i don’t want to find out that bad.
+ a review i found on that site from a person who paid said it transfer’s them to a site where they could do background checks but had nothing to do with cell phones.
I have google this im not just being stupid and posting without looking it up myself.