First you can check whether anyone uses familiy tracking app on yours phone plan. That could. There are number of andorid apps which can be used to track the location of any phone. Check out here:
If your phone happened to be Apple-based, hopefully you went to Settings and turned on "Find My iPad" (and I use an iPad, but that can be replaced with iPod, or iPhone, etc). If you did, then you could track the exact location of your iDevice from ANOTHER device, thereby helping you find your lost phone.
Go to your provider website and go to your account. If you havent set one up do so from there you can track calls check gps location data usage etc, or you can call your company and report it stolen
I have lost my iPhone 6 last Monday and I get it back using the iLostFinder. Hope you won't have this bad experience.
Install the LocOf GPS Tracker apps on a mobile phone to view it's location online.