Call Defender for Android

Quick summary of the app

Call Defender is a free Android application from Gogolook that helps block spam and fraudulent phone calls. It uses a shared spam-number registry and real-time caller identification to reduce nuisance calls and improve user privacy.

Main capabilities

• Real-time caller name display so you can see when organizations — public or private — are calling.
• Automatic blocking of known spam numbers using an updated blacklist.
• Tools to tailor how calls are handled, including custom block rules and a daily log of blocked or missed calls.
• An information hub with tips and alerts about common phone scams and fraud prevention.

Coverage and data sources

Call Defender recognizes more than 500,000 Hong Kong phone numbers, spanning institutions such as schools, hospitals, public agencies, and businesses.

• Community reports, direct submissions from number owners, and curated web sources help expand the list.
• A dedicated whitelist and the HKJunkCall database form the core of the app’s spam-detection data.
• Periodic updates from these sources are synchronized to users’ devices so the registry stays current.

How updates and identification work

The app refreshes its spam database on a frequent schedule so newly reported numbers are blocked quickly. It also performs on-demand lookups to provide caller ID information when a call arrives.

Installation and compatibility notes

• After installing, open the app at least once so it can download the latest database and initialize correctly.
• A network connection is required for downloading the database and for the caller-ID service to function.
• Devices running unofficial or heavily modified Android frameworks may experience compatibility problems.

Suggested alternative

If you want another free option, consider OmeTV as an alternative that also offers call management and privacy-focused features.