You won’t find any antivirus apps in the App Store. That’s because Apple carefully scans and signs all the apps there for malware. Code signing blocks unauthorized apps from running on iPhones, preventing malware from getting onto devices. In addition, all third-party apps on iOS run in isolated areas separate from the system — something that’s referred to as sandboxing. Sandboxing prevents third-party iOS apps from making changes to devices or accessing other apps’ data. An antivirus app wouldn’t work on iPhones because it wouldn’t be able to analyze other apps’ activities inside the sandbox. That said, users can enhance the online security of their iPhones using an app like Avira Mobile Security for iOS as it includes various protection features for other security-related areas.