Call Defender is a free app developed by Gogolook for Android devices. It is a spam call blocking app that has protected millions of users against malicious spam calls. The app provides a spam database that blocks spam calls automatically, and the database is provided by HKJunkCall. Call Defender also provides real-time caller identification, showing the name of public or private organizations when they are calling you. The app identifies over 500 thousand HK phone numbers, which include hospitals, educational institutions, and so on. The data comes from HKJunkCall Whitelist, community, Internet, websites, and number owners. The app checks the database every 10 minutes, and updates to the device when there is a new spam number, effectively eliminating all spam calls that frequently harass people.

Call Defender provides the simplest way to block unwanted calls and protect your privacy with ease. The app also provides advance settings for customizing block calls, search spam number database, and daily call report for any blocked/missed calls. It also has an anti-fraud information center, providing educational messages about fraud to the user. To make sure Call Defender works properly, please load the app at least once after installation. Network connection is required for database download or caller ID feature. The devices using unofficial Android framework may have compatibility issues.