Android phones that are not rooted are already secure without antivirus apps. Practices such as avoiding non-trusted websites, not opening non-trusted emails, and only downloading apps from the Google Play store will prevent many viruses.
If you want to use an antivirus app, don't keep it on your phone. Instead, occasionally download the app temporarily to scan your phone, then remove the app when the scan is finished.
Antivirus apps tend to interfere with phone service and functionality, causing problems.
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