How to locate my iPhone if I haven't/can't set up iCloud on said phone?

I didn't know about this system until AFTER I'd lost my iPhone.

If your phone is stolen than you can contact the police, they can track your iPhone with a phone number by GPS. If you lost your phone, than just keep calling it over and over with someone else phone until you find it or hope someone picks up. Until then there's no way to locate an iPhone if it don't have "Track my iPhone" turned on. Normally you can go to icloud.com and track your iPhone GPS location as long as you have iCloud and "Track my iPhone"