Got my son a Note 5 for Christmas yesterday, I know on mine i run Lookout as the native antivirus and every couple of weeks I scan it with Malwarebytes and have not had a problem. When I was at the ATT store activating it for him the salesman told me NOT to install lookout and malwarebytes as they will harm the phone (Samsungs come with lookout already preloaded) he told me to use Avast (I have used that for PCs and know its a good product) and that has a malware scanner and antivirus all in one. What are peoples opinions or suggestions?