I use lookout premium. You can put it on 2 phones (android, windows or IOS) and it will scan everything, also provides safe browsing, protection against identity theft, firewall, remote wiping and locking, remote backup (files, pictures, calls, sms etc...), remote location, remote alarm. They have just added a facility so that it always sends it's location just before the battery dies.
They do a free version, with just the main functions.