How to find a lost iPhone without the Find My iPhone app?

I lost my iPhone or it got stolen at school. I don't have the app Find my iPhone on it and my iCloud account isn't turned on. Is there of activating an iCloud account from the computer (or does it have to sync to the phone).

I don't think there's a way. I once lost my iphone in a mall, i went to the apple store and asked them for ways to find it. They said the only way was the app ''Find my iphone'' which i didn't have. It's been 7 months now, bye bye phone.

Sadly, Yet another reason some people are too young to have smart phones.

Sorry about it.