What's the best Android app for stopping intrusive ads and securing my phone?

Shield is a security-focused application that combines antivirus scanning with proactive ad-blocking capabilities, making it a suitable choice for users seeking to improve both device safety and usability. The app's primary function is to perform regular system scans, a feature highlighted by users who run daily checks for malware and vulnerabilities. Its effectiveness against intrusive advertising is a significant draw; reviews indicate the app successfully halts pop-up ads that can render a device difficult to operate, thereby restoring basic functionality. For individuals with heightened security concerns, such as those recovering from identity theft, the app provides a straightforward layer of protection with its monitoring features. It also integrates directly onto the home screen for quick access. A notable limitation is that its ad-blocking may be most effective within the app's own ecosystem and may not block all in-app or browser-based ads universally. Some users might find its feature set less comprehensive compared to standalone, specialized security suites, but for core scanning and ad suppression, it receives consistently positive feedback. The interface is reported to be simple, though occasional notifications for promoting other services from the developer have been mentioned in broader feedback not shown here.