i have never used any anti-virus app on my phone. android does a pretty good job at notifying you when an app is being installed. you just need to use common sense. no banking over public wifi. check the permissions of the apps before you install them. and stay away from certain websites.Is the free free version of avg anti virus any good
if you are going use one, then this is what i recommend:
Malwarebytes Security: Virus Cleaner, Anti-malware
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