Q: Find my iphone don't use

Have you enabled Find my iPhone on the device, and is Location Services turned on?

See: http://support.apple.com/kb/TS4006

What do you mean you "don't use this function"?

What function don't you use?

There's the app called "Find My iPhone", which you can use to track another device as well as the one currently being used, and there's the service "Find My iPhone", which must be turned on for iCloud to be able to track your device (as long as it is still connected to the Internet and has its sim installed - otherwise icloud can't track the device).

If you don't use the Find my iPhone function, then it won't work.

Find my iPhone needs to be configured on the device and Location Services needs to be turned on and the device needs an internet connection to have any chance of working.