Can I locate my iPhone without find my iPhone?
If your phone was stolen and you didn’t have the Find My iPhone app installed, I’ve got good news: It doesn’t matter! … You can use Find My iPhone in virtually any modern web browser. Just go to iCloud.com and log in using the Apple ID you used to set up your iPhone (which is probably the same as you use for iCloud.
How do you find someone elses iPhone?
Open the Find My app. Choose the Devices or Items tab. Select the device or item to see its location on the map. If you belong to a Family Sharing group, you can see the devices in your group.