Downloading call blocker APKs allows you to manage unwanted calls, but it's generally safer to use official app stores to ensure security updates and verified software. Below are reputable Android call blocker apps with links to their official Google Play Store pages and known third-party APK sources.

If you prefer downloading the raw APK file rather than using the Play Store, these sites are common repositories: Hiya: Spam Blocker & Caller ID - Apps on Google Play

: Features a community-driven blacklist and allows for wildcard blocking.