I lost my iphone how can i find it?

The iPhone is turned off

You can't, you should probably just give up and get a Nexus 4.

Ask Saint Anthony;
say out loud Oh Saint Anthony my best friend, where is my i phone
it works every time- with in a few minuets you will find it and I'm not even catholic
My mother in law told me to do this. It is crazy, but it really works- try it.

If you haven't open up the feature "find my iphone", you will lose it

I'm afraid you are out of luck. Find My iPhone will not work if the phone is offline or has been reset to factory settings.