Call screening
AI Call Screening on Android: Deciding What Happens to Unknown Callers
Screening is the part of an AI spam call blocker most people never think about. Detecting a risky call is only half the job. The other half is choosing what the phone should do with it, and that choice is different at 2 p.m. on a workday than at 2 a.m.
Block Guard: Spam Call Blocker gives each category of call its own handling option, within what your Android version and default phone app allow. Here is how to think about the four outcomes.
Ring normally
Use it for: Trusted contacts, whitelisted numbers, and calls the AI rates as low risk.
This is the default for anything on your safe list. The AI cannot change it.
Silence
Use it for: Unknown or suspicious calls during focus hours, sleep, or work when you want zero interruptions.
The call still lands in your call history and the blocked-call log, so nothing is lost.
Send to voicemail
Use it for: Calls the AI scores as risky but that you cannot rule out completely.
Real people leave messages. Spam campaigns almost never do. This is the safest middle setting.
Reject or hang up
Use it for: Blocked numbers, blocked patterns, and calls you are confident are spam.
Best reserved for hard rules. Use it for the AI layer only after your log confirms the scoring fits your calls.
Start with voicemail for AI-flagged calls
The mistake most people make with a new AI call blocker is setting everything to reject on day one. Then a legitimate caller from a new number gets cut off, the person blames the app, and turns the whole thing off. Voicemail is the setting that lets the AI be wrong without costing you anything: if the call mattered, there is a message waiting.
Why unknown is not the same as suspicious
An unknown caller is simply a number that is not in your contacts. A suspicious caller is one the risk score, a pattern rule, or a reputation database has flagged. Treating them the same is how people miss their new doctor. Block Guard lets you handle unknown callers with one rule and AI-flagged callers with another, so a low-risk unknown number can still ring while a high-risk one goes to voicemail.
Match the handling to the moment with profiles
Profiles are saved sets of screening choices. Rather than re-tuning every setting at bedtime, switch to a stricter profile or let a schedule do it. Three common ones:
Everyday
Safe list rings. Blocked patterns are rejected. AI-flagged calls go to voicemail. Unknown calls that score low still ring so a new contact can reach you.
Sleep
Only trusted contacts ring. Everything else is silenced. Pair it with a schedule so it turns on and off by itself.
Work
Unknown business callers ring, but spoofed local patterns and AI-flagged calls are sent to voicemail so a customer from a new number is not lost.
Checking that screening is doing what you expect
- Open the blocked-call log after the first two days and read the reason on each entry.
- If a real caller appears, add them to trusted contacts. Do not loosen the AI handling for everyone because of one number.
- If the same area code or prefix keeps appearing, write a pattern rule so those calls are rejected before they ever reach the AI.
- If an expected call did not ring, confirm the active profile, the schedule, and that permissions are still granted.
For the full walkthrough of permissions, safe lists, and profiles, read how to use Block Guard.
More on AI Spam Call Blocking
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How to Use Block Guard
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Read the guide →How AI Spam Call Blocking Works
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Read the guide →AI vs. Blocklist Call Blocking
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Read the guide →AI Spoofed Call Detection
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Read the guide →Try an AI Spam Call Blocker That Explains Its Decisions
Block Guard pairs Adaptive AI call risk scoring with blocklists, unknown-caller handling, spoofing rules, SMS filtering, and a blocked-call log that shows why each call was stopped.