Free Guide to Stopping Unknown Calls and Spam

Understanding Unwanted Calls and Why They Happen

Unwanted calls have become a widespread problem affecting millions of people daily. According to the Federal Communications Commission (FCC), Americans received approximately 3.7 billion robocalls in 2023 alone. These calls range from telemarketers selling products or services to scammers attempting to steal personal information or money. Understanding the types of unwanted calls you might receive is the first step toward managing them effectively.

Robocalls are automated calls that use a computerized system to deliver pre-recorded messages or connect you to a live sales representative. These calls often originate from legitimate companies conducting surveys or promoting products, but they can also come from fraudsters. Scam calls typically claim you have won a prize, owe money, or need to verify account information. Telemarketing calls promote products, services, or charities. Some unwanted calls may appear to come from your bank, the IRS, or other official organizations, but are actually spoofed numbers designed to trick you into believing they are legitimate.

Scammers and telemarketers obtain phone numbers through various means. They may purchase lists from data brokers, randomly generate numbers, or harvest numbers from websites and social media profiles. When you answer an unwanted call, your number may be marked as "active" and sold to other callers, resulting in even more unwanted calls. This is why many people report an increase in unwanted calls after picking up just one suspicious call.

Practical takeaway: Recognizing the common types of unwanted calls—robocalls, scams, telemarketing, and spoofed numbers—helps you respond appropriately rather than engaging with callers who have no legitimate reason to reach you.

Built-In Phone Features That Block Unwanted Calls

Both Apple iPhones and Android devices offer built-in tools designed to reduce unwanted calls without requiring you to purchase additional services. These features use databases of known spam and scam numbers to identify problematic callers before you even see the call on your screen. Learning to use these existing tools on your device can significantly reduce the number of unwanted calls you receive.

iPhone users can access call filtering through the Phone app settings. Apple's system screens calls against its database of known spam numbers and can send them directly to voicemail. You can turn on "Filter Unknown Callers," which sends calls from unknown numbers to your voicemail instead of ringing your phone. This feature only allows calls from people in your contacts, recent calls, and Siri Suggestions. While this may cause you to miss some legitimate calls, you can check your voicemail to see if anyone important tried to reach you. Additionally, you can block specific numbers by opening a contact, tapping the information icon, and selecting "Block this Caller."

Android devices provide similar functionality through the Phone app. Google's Call Screen feature can identify potential spam calls and block them automatically. You can enable "See caller & spam protection" in your Phone app settings. Like iPhone, you can manually block individual numbers by opening the call log, holding down on a number, and selecting "Block number." Some Android phones also have a "Spam protection" setting that flags suspicious calls before they reach you. Samsung devices specifically offer "Spam Protection" as a built-in feature that identifies and blocks known spam numbers.

Both platforms allow you to create a "Do Not Disturb" or "Focus Mode" that silences calls from anyone not in your contacts during specific times. This is useful for maintaining uninterrupted work or sleep time while still allowing important contacts to reach you in emergencies.

Practical takeaway: Before installing third-party apps, explore your phone's native settings to enable call filtering and blocking. These free tools often provide substantial reduction in unwanted calls without any additional cost or setup.

Third-Party Apps and Services for Call Blocking

Beyond built-in phone features, numerous third-party applications offer additional layers of protection against unwanted calls. These apps maintain larger databases of known spam and scam numbers, often updated in real-time as users report new offenders. Some popular options include Truecaller, RoboKiller, Nomorobo, Call Control, and Whoscall. Many of these apps offer free versions with basic features, though some require paid subscriptions for advanced protection.

Truecaller is one of the most widely used call-blocking apps globally, with over 500 million downloads. The free version identifies spam calls and displays caller information. It maintains a database of known spam numbers contributed by its user community. Truecaller blocks spam calls automatically and provides options to report new spam numbers, which helps protect other users. The paid version adds features like call recording and advanced spam detection.

RoboKiller uses artificial intelligence to identify and block robocalls, including those that use spoofed numbers. The app learns from your behavior and feedback to improve its blocking accuracy over time. It offers a feature called "Answer Bots" that can answer and confuse robocallers, potentially removing your number from future calling lists. RoboKiller is primarily a paid service, but it offers a free trial period.

Nomorobo operates as a free service for both landlines and cell phones. For landlines, you can register your number on their website, and calls are filtered through their system before reaching your phone. For cell phones, they offer a free app that provides similar blocking functionality. Nomorobo updates its spam list multiple times daily, making it responsive to emerging threats.

When selecting a third-party app, consider factors such as whether it offers a free version, how frequently it updates its spam database, what permissions it requires, and whether it allows you to whitelist important numbers that might otherwise be blocked. Read user reviews on app stores to understand real-world performance.

Practical takeaway: Third-party apps extend your phone's native blocking capabilities with larger databases and artificial intelligence. Test a free version of one or two apps to determine which works best with your calling patterns before committing to a paid subscription.

Do Not Call Registry and Reporting Unwanted Calls

The National Do Not Call Registry, established by the Federal Trade Commission (FTC), is a free resource where you can register your phone number to reduce telemarketing calls. While it does not stop all unwanted calls—particularly scam and robocalls—it provides a legal avenue for reducing legitimate telemarketing calls. More importantly, registering helps you identify violations and report them to authorities.

You can register your number at donotcall.gov or by calling 1-888-382-1222 from the phone you wish to register. Registration is permanent and does not expire, even if you change phone providers. After you register, telemarketing companies have 31 days to stop calling you. If a telemarketer continues to call after this period, you can report them to the FTC.

It is important to understand which callers are exempt from the Do Not Call Registry. Political organizations, charities, surveys, and companies with which you have an existing business relationship are allowed to call registered numbers. Additionally, companies may call if you have previously given them written permission to do so. Debt collectors and scammers do not follow these rules, which is why registration alone does not eliminate all unwanted calls.

When you receive an unwanted call, you have several options for reporting it. The FTC maintains a complaint database at reportfraud.ftc.gov where you can report spam calls, unwanted robocalls, and scams. Reporting provides information to law enforcement and helps the FTC identify patterns and trends. You should record details about the call including the time, number displayed, message content, and any personal information the caller requested. The FCC also accepts complaints about unwanted calls through its Consumer Complaint Center.

Your phone provider may offer additional reporting options. Most carriers allow you to forward spam text messages to specific numbers (typically 7726 or SPAM on your phone) or provide options within their apps to report unwanted calls directly. Reporting these calls helps your carrier improve its own filtering systems.

Practical takeaway: Register your number with the Do Not Call Registry and report violations, as this creates a documented record and helps authorities track patterns. While registration will not stop all unwanted calls, it reduces legitimate telemarketing and establishes a baseline for identifying illegal calling activity.

Practices to Protect Your Number from Being Targeted

Reducing the number of unwanted calls you receive requires limiting how widely your phone number is distributed. Scammers and telemarketers