Locate your iPhone on a map.

Go to icloud.com/find or download the free Find My iPhone app on another iOS device. Sign in with the Apple ID you use with iCloud. Select the device you want to locate from the list. A green dot means it’s online, and a gray dot means it’s offline. Note: To locate and protect your device, you need to have set up Find My iPhone before it was lost. More: Find My iPhone overview

by via Apple - Support - Most Recent - iPhone