If I lose my Samsung Mobile Phone, how will i be able to get it back?

Welcome to Android Central! All Android devices can be tracked using Android Device Manager--see more info here: https://support.google.com/accounts/answer/3265955?hl=en

There are many other 3rd party anti-theft apps that can also help to track a lost device, like Lookout. The main limitation is that the device has to be on and connected to the web in order for these kinds of functions to work.