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Viruses often use your phone or tablet's data plan while running in the background. This may cause sudden spikes in data usage. Check your billing statement for abnormal charges from increased data usage. Some viruses may make purchases or download apps without your knowledge. If you see an app icon on the home screen or in the app drawer that you don't recall downloading, it could be the work of a virus. Even if the app looks legitimate, use caution if you don't remember downloading it. If an app that never caused any problems in the past begins crashing frequently, a virus could be the reason. Pop-ups might not seem out of the ordinary while browsing the web. However, when you're suddenly inundated by pop-ups, your Galaxy may have an infection. Whatever you do, do not tap on any links in pop-up ads. This could make things worse. Since viruses run constantly in the background, your Galaxy may need more frequent charging. If you use used to charge the Galaxy every 2 or 3 days but suddenly have to charge every day, a virus could be the culprit. Your Galaxy comes with its own security application, but you can use any you prefer. See Running a Security Scan to check your phone or tablet for viruses.
Check for increased data usage. Analyze your bank account for unexplained charges. Look for apps you didn't download. Watch for frequently crashing apps. Pay attention to pop-up ads. Monitor your battery usage. Run a security scan.