How does Truecaller identify spam calls?

Truecaller identifies unknown callers and automatically flags potential spam calls using a vast database of over 500 million spam numbers.

Can I block spam calls without using a third-party app?

Yes, many smartphones have built-in features and carriers offer services to help block spam calls.

Top Apps to Block Spam Calls on Your US Phone

Spam calls are a persistent nuisance for many smartphone users in the United States. These unsolicited calls not only disrupt daily life but can also pose security risks. Fortunately, several applications are designed to help users block these unwanted calls effectively.

What Are Spam Calls and Why Are They a Problem?

Spam calls, often referred to as robocalls, are unsolicited calls made by automated systems or telemarketers. They can range from harmless marketing pitches to fraudulent schemes aiming to steal personal information. In 2025, Americans received over 52.5 billion robocalls, averaging roughly 13–15 spam calls per person per month. (antivirus.com)

How Can Apps Help Block Spam Calls?

Specialized apps can identify and block spam calls by leveraging extensive databases of known spam numbers, user reports, and advanced algorithms. They often provide real-time caller ID, automatic blocking of suspected spam, and the ability to report new spam numbers, thereby enhancing the community's collective defense against such calls.

Which Apps Are Effective in Blocking Spam Calls?

Several apps have proven effective in blocking spam calls for US users:

Robokiller: Robokiller not only blocks spam calls but also engages scammers with pre-recorded "answer bots," wasting their time and reducing the number of calls they make. (avnexo.com)
Truecaller: With a vast database of over 500 million spam numbers, Truecaller identifies unknown callers and automatically flags potential spam calls. (avnexo.com)
Hiya: Hiya offers advanced spam detection and integrates well with carriers like AT&T and T-Mobile, providing real-time caller ID and automatic spam blocking. (avnexo.com)
RealCall: RealCall uses AI algorithms to detect, engage, and block spam calls and messages, offering a reverse phone lookup service and customized answer bots. (en.wikipedia.org)

How Does Robokiller Compare to Other Apps?

Robokiller stands out by not only blocking spam calls but also actively engaging scammers with pre-recorded "answer bots," wasting their time and reducing the number of calls they make. This proactive approach differentiates it from other apps that primarily focus on blocking calls without engaging the scammers. (avnexo.com)

Are There Built-in Features on Phones to Block Spam Calls?

Yes, many smartphones come with built-in features to help block spam calls:

iPhone: Users can enable the "Silence Unknown Callers" feature, which silences calls from numbers not in their contacts, recent calls, or Siri Suggestions.
Android: Some Android devices offer built-in spam protection features, such as Google’s Call Screen, which screens unknown calls and provides real-time transcriptions.

How Do Carrier Services Help in Blocking Spam Calls?

Carriers also offer services to help block spam calls:

AT&T: Offers Call Protect, which displays a “V” (for verified) on your caller ID for calls considered legitimate and blocks potentially fraudulent calls by giving a busy signal. (consumerreports.org)
T-Mobile: Provides Scam ID and Scam Block, which identify and block suspicious calls before they ring. (consumerreports.org)
Verizon: Automatically enrolls eligible customers in the free version of Call Filter, which detects spam and blocks high-risk calls. (consumerreports.org)

How Do I Choose the Right App to Block Spam Calls?

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

Database Size: A larger database increases the app's ability to identify and block spam calls accurately.
User Reviews: Check user feedback to gauge the app's effectiveness and reliability.
Privacy Policies: Ensure the app respects your privacy and does not misuse your data.
Additional Features: Some apps offer extra functionalities, such as call recording, voicemail protection, or the ability to report new spam numbers.

Conclusion

Spam calls are a significant inconvenience and potential security threat. Utilizing dedicated apps like Robokiller, Truecaller, Hiya, or RealCall can effectively block these unwanted calls. Robokiller's unique approach of engaging scammers with "answer bots" sets it apart from other solutions. Additionally, leveraging built-in phone features and carrier services can provide an extra layer of protection. By combining these tools, you can significantly reduce the number of spam calls you receive.