Block unknown numbers on Android
Want to block unknown numbers on Android? Learn built-in options and how Block Guard gives you better controls using blocklists, whitelists, and rules.
Blocking unknown callers can cut spam dramatically, but you don’t want to miss important calls (doctors, deliveries, school, work).
Android built-in options
- Some dialer apps let you “Silence unknown callers.”
- You can block individual numbers, but it’s manual and slow.
A better approach
- Whitelist first: add family, work, and key services so they always get through.
- Use rules: block unknown callers in certain situations (work hours, sleep hours, etc.).
- Review logs: verify what was blocked and adjust.
Block Guard features that help
- Whitelist + blocklist controls
- Tools to handle spoofing patterns
- SMS filtering options (optional)
Related: block scam calls and stop robocalls.
Quick links: Home · Best Call Blocker · Stop Robocalls · SMS Spam Blocking