Most phone companies provide remote tracking if you've allowed Locations permissions to be turned on for the phone. I personally use Google's 'Find My Phone' option for my android devices.
I know a few folks who have attached key trackers to their devices, in case they lose them during their daily routine. We happen to have a Best Page just for that. Check it out here: https/www.tomsguide.com/us/best-key-finders,review-2657.html