How to find my stolen iphone 4S?

Someone today stole my iphone 4S! How can I find it?! I really need it!

Maybe you can ask Siri

Go to icloud.com and use your apple id to sign in to it then you have access to your phone… From there you can lock your phone and track it with the gps locator.

If you installed Find My iPhone you could use that to help. If not, then there's nothing you could do.

Somebody can help me. I lost my iphone 4s last night… How i can find my phone? I can still find that phone even they already change the sim card or sim pack?