Q: i have lost my iphone 6

Sorry to hear that. Did you already check this article?

If you have lost or found an Apple product, please contact your local law enforcement agency to report it.

You can take steps to find your lost or stolen iPhone, iPad, iPod touch, or Mac if you've enabled Find My Mac and Find My iPhone apps. Using your Find My apps allows you to put your missing device in Lost Mode, see its location, or erase its data. Other than the Find My iPhone and Find My Mac apps, there is no other Apple service that finds, tracks, or otherwise flags your device for you.

Learn how to locate Apple product serial numbers.

copied from: Report a lost or stolen Apple product - Apple Support

Hi

To track your iPhone go to find my iPhone on your other apple device .

Or use your pc  www.icloud.com .

This will only work if iPhone is switched on.

Cheers

Brian