Sign into your Google account or the Find My Device app. Just because you haven't signed in before, doesn't mean you can't sign into it now and find your phone. You didn't have to be signed into the app on your old phone. If the lost device was signed into your Google account, it can be located. In your Google account, you can locate, secure and/or erase your device so no one can use it until you get it back (if you do). If the phone died and is no longer on, you will see the last location. You can also send a notification to the phone (I guess telling the finder where to reach you) You, of course, will have to do this from another device since you don't have yours. If you have a computer, it's easiest to do it from there. If you don't have another device, you can see if a friend will let you use theirs or go to a library or someplace where you can use a computer. DO NOT forget to log out of your Google account on any device that is not yours.
