Re: Does S5 have a built in kill/find app?
You can wipe your phone clean and disable it by googling "Android Device Manager." You must sign in with your Google password. From there you can reset your phone and / or lock it with a new password. You can also locate the phone within 15 meters and have it ring continuously until the battery runs out.
Thus, if lost, you can find it. If stolen, you can alert the police to its exact location. If you forget the password, you can set a new one. If you want to wipe it clean and place a new password lock on it, you can also do that.
ATT offers a similar service and will also replace your phone if lost or stolen. You must sign up within 30 days of purchase and it costs $ 10 per month. Since the google service is free, I'm just going with their service.