Best way to reverse lookup

hey guys, just wondering what's the best way to reverse lookup a phone number. i just wanna make sure, since im tryin new ladies that i dont get the po-po. any tips on best ways to reverse lookup a phone number? I tried google and facebook, but they're a pain in the ass and i dont have luck usually with them, and i'd rather not pay

I got a call from 555-1234.
So I reverse looked up 432-1555... and it wasn't pretty....

Edit add: My Mensa friends were fuckin impressed though....

fuckin Mensa