Anti-Virus for Phones

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Years ago, when I was quite new to the computer world, I was told to never have more than one anti-virus on my computer, because the software would cancel one another out. Fast forward to today where I now have a smart phone where I can almost do everything on it that I do on my computer. I forgot to ask the business where I bought my phone, but my husband asked and was told our phones (Samsung Galaxy J7) has a default anti-virus. Today, when he went in to pay our bill, I wanted him to ask about the anti-virus, and if it has an anti-malware and if the phone should also be defragged. The owner wasn't there, but his helper said she doesn't know, but what she tells everyone is to download AVG. Now unless things have changed, or having more than one anti-virus doesn't apply to phones, this lady is telling the customers the wrong information. Since I first learned about no more than one anti-virus here on MyLot (One of many benefits to this site, the stuff I learn ) I'm hoping someone can clarify this information and if perhaps if anyone knows about installing an anti-malware (I want to use the same anti virus/malware that is on my computer) and if phone should be defragged occasionally.