Learn How to Block Unwanted Phone Calls Today

Understanding Why Unwanted Calls Happen and Who Makes Them

Unwanted phone calls come from many different sources, and understanding where they originate helps you manage them better. According to the Federal Trade Commission (FTC), Americans received over 3.7 billion spam calls in 2021 alone. These calls fall into several categories, each with different motivations and methods.

Telemarketers represent one major source of unwanted calls. These are businesses that contact you to sell products or services, from credit cards to home security systems. While some telemarketers follow the law and respect the National Do Not Call Registry, others ignore these rules or use technology to mask their numbers and identities.

Scammers make another significant portion of unwanted calls. They impersonate government agencies, banks, or utility companies to trick people into revealing personal information or sending money. Common scams include fake IRS calls claiming you owe taxes, calls pretending to be from your bank about fraudulent charges, and calls about package delivery problems that don't exist.

Robocalls represent a rapidly growing problem. These automated calls use pre-recorded messages and artificial intelligence to reach thousands of people quickly and cheaply. Some robocalls are legal—like appointment reminders from your doctor—but many are not. Illegal robocalls often promote fake products, political campaigns, or scams.

Other sources include debt collectors (sometimes pursuing debts you don't owe), survey companies, charities, and wrong numbers. Understanding the source of calls helps you decide which blocking method to use.

Practical Takeaway: Keep a log of unwanted calls you receive, noting the number, time, and type of call. This information helps you identify patterns and choose the most effective blocking strategies for your situation.

How Your Phone's Built-In Call Blocking Features Work

Most modern smartphones come with built-in tools to block unwanted calls without needing extra apps or services. These features vary depending on whether you use an iPhone, Android device, or traditional landline phone, but they all work on the same basic principle: identifying numbers you don't want and preventing them from reaching you.

On iPhones, you can block specific numbers directly from the Phone app. When you receive a call you don't want, tap the "i" icon next to the number and scroll down to select "Block this Caller." The person's calls, text messages, and FaceTime requests will be blocked. You can also block contacts before they call by going to your Contacts app, finding the person, and selecting "Block this Caller." Apple also offers a "Silence Unknown Callers" feature that sends calls from numbers not in your contacts directly to voicemail.

Android devices work similarly but with slight variations depending on your phone manufacturer. In the Phone app, press and hold on a number in your call history, then select "Block number." Some Android phones also have a "Block unknown" setting in the Phone app settings that sends calls from unknown numbers to voicemail. Samsung phones offer additional features like spam protection that automatically identifies and blocks likely spam calls.

Most carriers—AT&T, Verizon, T-Mobile, and others—offer free or low-cost spam filtering services. These services use algorithms and databases of known spam numbers to identify suspicious calls before they reach you. Verizon offers "Call Filter" for free on many plans. AT&T provides "AT&T Call Protect." T-Mobile includes "Scam Shield" protection. These services continuously update their databases as new spam and scam numbers are identified.

Landline phones have fewer options, but many modern landline services include call screening features through your phone provider. Some landline systems allow you to program specific numbers to be blocked or require callers to announce themselves before connecting.

Practical Takeaway: Check your phone's settings today to enable whatever call blocking features came with your device. These built-in tools are often overlooked but provide the first line of defense against unwanted calls.

Registering on the National Do Not Call Registry

The National Do Not Call Registry is a free government service managed by the Federal Trade Commission that allows you to reduce telemarketing calls. While it doesn't stop all unwanted calls—scams and robocalls ignore it, and some legitimate businesses are exempt—it does help reduce calls from many legal telemarketers who are required by law to check the registry.

You can register your phone number in two ways. The easiest method is visiting donotcall.gov and entering your phone number directly on the website. This takes less than two minutes and is effective immediately for many callers. Alternatively, you can call 1-888-382-1222 from the phone you want to register. The voice system will confirm your number and add it to the registry.

Your number stays on the registry indefinitely, or until you remove it. You don't need to re-register every year. However, if you change your phone number, you'll need to register the new number separately.

Important limitations exist with the Do Not Call Registry. Charities, political organizations, surveys, and companies you've done business with in the past 18 months are allowed to call you even if you're on the registry. Debt collectors and government agencies also aren't restricted by the registry. Additionally, scammers simply ignore the registry because they're already breaking the law. The registry only affects legitimate telemarketers who comply with regulations.

If you continue receiving unwanted calls from telemarketers after registering, you can file a complaint on donotcall.gov. The FTC uses complaint data to pursue legal action against violators. If you receive calls from numbers claiming to be from your bank, the IRS, or government agencies, these are typically scams—the Do Not Call Registry won't stop them, and you should hang up and report the call to the FTC.

Practical Takeaway: Register on the Do Not Call Registry as part of a multi-layered approach to reducing unwanted calls. Don't expect it to eliminate all unwanted calls, but it does reduce the volume from many legitimate sources.

Using Third-Party Call Blocking Apps and Services

Beyond your phone's built-in features and your carrier's offerings, numerous third-party apps offer additional call blocking and identification capabilities. These apps work by comparing incoming calls against databases of known spam and scam numbers, and some use artificial intelligence to identify suspicious calling patterns.

Popular options include RoboKiller, which uses audio fingerprinting technology to identify robocalls and either blocks them or answers with "answer bots" that waste the caller's time. TrueCaller provides caller identification and blocking, showing you information about who's calling before you answer. Call Control and Nomorobo are other widely used options that maintain databases of known spam numbers and block them automatically.

When choosing a third-party app, consider these factors. Most offer free versions with basic blocking capabilities, while premium versions add features like advanced filtering, reverse phone number lookup, or call recording. Check whether the app is available for your specific phone type—some work only on Android, others on iPhone, and some on both. Read the privacy policy carefully, as call blocking apps have access to your call history and contact information.

Some third-party services work differently from apps. For example, you can create a whitelist—a list of approved numbers that are always allowed through—and send all unknown calls to voicemail. This approach flips the standard approach on its head: instead of blocking known bad numbers, you only accept calls from people you know. This method works well if you don't expect many calls from unfamiliar numbers.

Regional services may also be available. In some areas, local phone companies offer call screening features that let you review and filter calls before they reach your phone. Some services charge monthly fees, typically between $3 and $15, though free versions are usually available with limited features.

One important note: while many call blocking apps are legitimate and helpful, some may claim to block all spam or provide complete protection—be skeptical of these promises. Spammers continuously develop new numbers and tactics, so no service can completely eliminate unwanted calls.

Practical Takeaway: If your phone's built-in features aren't sufficient, experiment with one or two third-party apps. Start with free versions to determine whether the extra features justify any costs before subscribing to premium services.

Recognizing and Reporting Scams and Fraudulent Calls