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TipsMay 6, 2026

How to Screen Unknown Callers on Your U.S. Phone Number

By The Robokiller Team

How to Screen Unknown Callers on Your U.S. Phone Number

Receiving unsolicited calls from unknown numbers is a common nuisance in the United States. In 2023, Americans collectively wasted approximately 227 million hours answering spam calls (cordcuttersnews.com). To mitigate this issue, consider the following strategies:

1. Utilize Built-in Smartphone Features

How can I use my phone's built-in features to block unknown callers?

Most smartphones offer native options to manage unknown calls:

  • iPhone: Activate the "Silence Unknown Callers" feature by navigating to Settings > Phone > Silence Unknown Callers. This will silence calls from numbers not in your contacts, though voicemails and recent calls will still be accessible (techradar.com).

  • Android: The process varies by manufacturer, but generally, you can find call blocking options in the Phone app settings under "Caller ID & Spam" or similar sections.

2. Install Third-Party Call Blocking Apps

What are some effective apps to block spam calls?

Several applications specialize in identifying and blocking spam calls:

  • Robokiller: Recognized as a market leader, Robokiller uses advanced algorithms to block spam calls and texts, boasting a 99% effectiveness rate (robokiller.com).

  • Truecaller: Offers real-time spam identification and blocking, with data indicating that Americans received an average of 2.1 billion spam calls per month in 2023 (businesswire.com).

  • RealCall: Utilizes AI to detect and block spam calls and messages, with a database of known numbers and an AI algorithm to identify phone numbers and block calls from robocallers, spammers, telemarketers, and scammers (en.wikipedia.org).

3. Register with the National Do Not Call Registry

How can I reduce unsolicited calls by registering my number?

By adding your number to the National Do Not Call Registry, telemarketers are legally required to refrain from contacting you. While this won't eliminate all unsolicited calls, it can significantly reduce them.

4. Be Cautious with Your Phone Number

How can sharing my number lead to increased spam calls?

Be mindful of where and with whom you share your phone number. Publicly available numbers are more susceptible to being added to spam lists.

5. Report Unwanted Calls

How can reporting help reduce spam calls?

Reporting spam calls to the Federal Trade Commission (FTC) can assist in tracking and potentially reducing such calls.

Conclusion

While it's challenging to eliminate all unsolicited calls, implementing these strategies can significantly reduce their frequency and impact. Utilizing a combination of built-in features, third-party apps, and proactive measures can help you regain control over your phone communications.

Highlights:

Frequently Asked Questions

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