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Smart Delay is optional and requires your consent: it allows callbacks within the default 30-minute window from outgoing numbers observed after activation. Records stay on your device, are excluded from backup, and are deleted when you disable the feature. Calls made before activation cannot be recovered.
Automatically block calls and SMS from unknown numbers
Unknown Call Blocker intelligently protects you from unwanted calls and spam. The app automatically blocks calls from numbers not in your contacts—no blacklists, no manual configuration. HOW IT WORKS - Any incoming call from a number NOT saved in your contacts is automatically blocked or silenced, depending on the chosen mode. TWO BLOCKING MODES • Aggressive Mode: completely rejects the call and sends it to voicemail • Silent Mode: allows the call but silences the ringtone and vibration (Android 10+) REPEAT CALL BYPASS - If someone calls twice within 5 minutes, the second call is allowed—ideal for emergencies from unknown numbers. SMART DELAY - If you recently called a number, the return call is automatically allowed. Perfect for when you call delivery, a doctor, or service providers. SMS BLOCKING SMS - notifications from unknown senders are silently discarded, without requiring SMS permissions. COMPLETE HISTORY - View all blocked calls and messages with date and time. Swipe to delete individual records. TOTAL PRIVACY - No data leaves your device. No servers, no data collection, no ads. 100% offline and free. LIGHT AND EFFICIENT - Runs in the background using native Android APIs (CallScreeningService). Minimal battery consumption.