What is the make/model of the lost phone?
Did you install any tracking software on the phone before it was lost?
The only option available is to try and use Android Device Manager. There are some requirements though..
Click here: https://www.google.com/android/devicemanager
The best thing about it is that you don’t need to install an app to be able to track your devices. The only requirement is that your device is connected to your Google account, turned on and connected to the internet. All you need to do is visit the Android Device Manager while being logged into your Google Account. Once the site is loaded it will automatically try to track down your phone. If you have several Android devices registered, make sure the right one is chosen in the dropdown menu.
In a recent update, Google implemented some of ADM’s features into their search results page. This means that you’re able to quickly locate any registered Android device right from the search results. By using the search phrase “where is my phone”, Google displays a little map above the search results in which it will try to find your phone. Once found, you can let it ring by clicking on “Ring” at the bottom left.
Although this makes it more convenient to find your phone quickly, it won’t offer you all the options you get with the full version of Android Device Manager.
Using ADM, you are able to track your registered Android devices, let your phone ring and wipe your phone’s data (which has to be enabled manually). Besides that, ADM doesn’t offer more options to remote control your phone.