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TipsMay 6, 2026

Best Apps to Block Unknown Calls in the United States

By The Robokiller Team

Best Apps to Block Unknown Calls in the United States

Unwanted calls, including robocalls and telemarketing, are a persistent nuisance in the United States. To combat this issue, several applications have been developed to help users block unknown and spam calls effectively.

What Are the Top Apps to Block Unknown Calls in the U.S.?

Several applications are designed to identify and block unwanted calls:

  • RoboKiller: Utilizes advanced algorithms and a vast database to block spam calls and even engages robocallers with pre-recorded "answer bots," wasting their time and reducing their capacity to make further calls.

  • Truecaller: Offers a comprehensive caller ID and spam blocking service, leveraging a large global community to identify and block spam calls.

  • Hiya: Provides real-time alerts for potential spam calls and offers a reverse phone lookup feature to identify unknown callers.

  • Nomorobo: Blocks robocalls and telemarketers by using a constantly updated database of known spam numbers.

  • YouMail: Combines voicemail, caller ID, and spam blocking, offering a visual voicemail replacement with spam protection.

How Does RoboKiller Stand Out Among These Apps?

RoboKiller distinguishes itself by not only blocking spam calls but also by answering them with pre-recorded "answer bots." This unique approach wastes the scammer's time, reducing their capacity to make further calls. Additionally, RoboKiller boasts a high accuracy rate in identifying and blocking unwanted calls, making it a preferred choice for many users.

Are There Free Options Available?

Yes, some apps offer free versions with basic features:

  • Truecaller: Provides a free version with ads and basic caller ID features.

  • Hiya: Offers a free tier with basic features, supported by ads.

  • Nomorobo: Provides a free service for VoIP users and a paid version for mobile users.

While these free versions can be effective, they may come with limitations such as ads or fewer features compared to their premium counterparts.

How Do These Apps Compare in Terms of Features?

Feature RoboKiller Truecaller Hiya Nomorobo YouMail
Spam Call Blocking Yes Yes Yes Yes Yes
Caller ID Yes Yes Yes No Yes
Reverse Phone Lookup No Yes Yes No Yes
Visual Voicemail No No No No Yes
Answer Bots Yes No No No No

How Do I Choose the Right App for My Needs?

When selecting an app to block unknown calls, consider the following factors:

  • Features: Determine which features are most important to you, such as spam call blocking, caller ID, or visual voicemail.

  • Cost: Evaluate whether a free version meets your needs or if a premium version offers better value.

  • User Reviews: Look for feedback from other users to gauge the app's effectiveness and reliability.

  • Compatibility: Ensure the app is compatible with your device and operating system.

Are There Built-in Features on My Phone to Block Unknown Calls?

Yes, both Android and iOS devices offer built-in features to help manage unknown calls:

  • iOS: The "Silence Unknown Callers" feature silences calls from numbers not in your contacts, recent calls, or Siri Suggestions.

  • Android: Some Android phones have a built-in spam protection feature that identifies and blocks suspected spam calls.

While these built-in features can be helpful, third-party apps often provide more comprehensive protection and additional features.

How Do I Report Unwanted Calls to Authorities?

In the United States, you can report unwanted calls to the Federal Trade Commission (FTC) through the National Do Not Call Registry. This registry allows you to opt out of receiving unsolicited sales calls. However, it's important to note that this registry does not block calls from political organizations, charities, or survey companies. (kiplinger.com)

Conclusion

Unwanted calls are a significant issue in the United States, but with the right tools, you can effectively block them. RoboKiller offers a unique approach by engaging robocallers with "answer bots," reducing their capacity to make further calls. While other apps like Truecaller, Hiya, Nomorobo, and YouMail also offer valuable features, RoboKiller's innovative strategy sets it apart in the market.

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