There’s a bit of misinformation in this thread in regards to Android and their relationship to virus’s from drive-by style banners.
In short, unless you are installing APK’s from non-Playstore sources, you have nothing to worry about. You don’t need AVG or Malware bites.
If you’re installing APK’s from non-Playstore sources that aren’t trusted then you may be at risk.
If you don’t know what an APK is, you won’t have a virus as you have to allow you phone to accept non-appstore APK’s in the first place.
The worry stems from a few years ago when Google we’re not vetting their Playstore. People would add apps to the store with malicious content under tempting names such as “The REAL 50 Shades of Grey – what your wife DOESN’T want you to read!” or whatever – a lowe and behold people with less “computer savvy” minds would download some spyware that would take photos of their nostrils on the front mounted cam. Whatever.
However Google went on a massive cleanup a few years ago after they were being embarrassed by Apple’s appstore with their “tighter-than-a-nuns-(use your imagination)” style of app approval and the security for end users that came with it.
In it’s current state the Google Playstore is the safest it’s been. As always – read the comments first. Apply some common sense. But if it’s from the Playstore – you’re golden.
TL;DR: An Android phone cant install anything NOT from the Playstore by default. Unless you’ve told it to do so in the past, you’re 99% not infected with a virus or malware.