You need to have your phone set up to find it. Go to setting on your phone, than find my phone, be sure both boxes are √ marked this will allow the phone to update ever few hours by it self.
OK now go to windows phone.com and login into it than go to my phone, you should see your phone and number top left corner, under that is a map, under that is red letters -find- ring -lock- erase click on this it will take you to the map, above the map is a little drop down box says road or birdseye view. To the far right in red letters is ring,lock,erase as long as you do not do any of those you will be OK.
Good luck finding your phone