I lost my iPhone (4). Is there something I can do to find it?

Is there a way to localize an iPhone if I have the serial number and other infos?

Added (1). I didn't download the findmyphone app on the iPhone… Can I still use it somehow?

Findmyiphone

Go to www.icloud.com then sing in with your icloud information and pray that you activated in your iphone…

Good luck and do it fast before they turn off your Iphone.