Understanding How Spam Calls Work and Why They Target You
Spam calls have become one of the most widespread communication problems in the United States. According to the Federal Communications Commission (FCC), Americans received approximately 3.8 billion robocalls in 2023 alone. These unwanted calls come from scammers, telemarketers, and bad actors using technology to reach as many people as possible with minimal cost.
Free Guide to Opening a Huntington Checking Account Online →
Spam callers obtain phone numbers through various methods. They purchase contact lists from data brokers who compile information from online sources, warranty registrations, contest entries, and data breaches. When you sign up for services online, provide your number to retailers, or even register a new phone, your number enters databases that eventually get sold to third parties. Scammers also use random number generation technology to call sequences of numbers systematically, hoping to reach someone who will respond.
The technology behind spam calls has grown more sophisticated. Robocalling systems can send thousands of calls per minute, making it a low-cost operation for criminals. Caller ID spoofing technology allows scammers to mask their true phone number and display a local or familiar number instead, making you more likely to answer. For example, a scammer might display a number that starts with your area code or even mimics your own number's first six digits.
Understanding the mechanics of spam calls matters because it reveals why simply blocking one number doesn't solve the problem. The caller won't call again from that same number—they'll use a different one. Common spam call schemes include tech support scams (claiming your computer has a virus), IRS impersonation, Social Security number theft attempts, prize and award scams, and utility company impersonation. Recognizing these patterns helps you identify suspicious calls before engaging with them.
Practical Takeaway: Spam callers use your phone number because it was sold or leaked through normal transactions. Assume any unsolicited call from someone claiming to represent a company or government agency may be fraudulent. Legitimate organizations typically don't cold-call about problems or require immediate payment over the phone.
Built-In Phone Features That Block Unwanted Calls
Both Apple and Android phones include call-filtering features that work at the operating system level. These tools don't cost anything and don't require downloading additional software. On iPhones running iOS 13 or newer, the Call Filter feature can identify likely spam calls and send them straight to voicemail. To enable this on an iPhone, open Settings, tap Phone, select Call Blocking & Identification, and toggle on the "Filter Unknown Callers" option. This setting sends calls from numbers not in your contacts directly to voicemail.
Learn About Paying Your Gillette City Utilities Bill →
Android phones offer similar functionality through the Phone app's built-in spam protection. On most Android devices, open the Phone app, tap the three-dot menu, go to Settings, then tap Spam and Call Screen. Enable "Filter spam calls" and "See caller ID and spam." Different manufacturers like Samsung, Google Pixel, and others may have slightly different menu layouts, but the core feature exists on most modern Android phones. Google Pixel phones additionally offer "Call Screen," which intercepts suspected spam calls and shows you a transcript of what the caller says before you decide whether to answer.
Your mobile carrier also provides filtering tools. Verizon offers Call Filter (both free and premium versions), AT&T provides Call Protect, T-Mobile has Scam Shield, and other carriers maintain similar services. The free versions block many common spam patterns, while premium versions offer additional features like reverse number lookup and caller name display. To access these services, check your carrier's website or call their customer service line to learn about enrollment.
Additionally, the Do Not Call Registry exists as a government resource where you can register your phone number. While this doesn't stop all spam calls (scammers often ignore the registry), it does prohibit legitimate telemarketers from calling your number. You can register at donotcall.gov or call 1-888-382-1222 from the phone you wish to register. Registration is permanent and free.
Practical Takeaway: Start by using your phone's built-in features. Enable "Filter Unknown Callers" on iPhone or "Filter Spam Calls" on Android. These settings won't block all spam, but they'll prevent many calls from ringing through. Check with your mobile carrier about their specific spam-blocking service and consider enabling it.
Third-Party Apps That Screen and Block Calls
Beyond built-in phone features, numerous apps are available that add extra layers of call screening. Popular options include RoboKiller, TrueCaller, Nomorobo, and Whoscall. These apps use databases of known spam numbers and employ algorithms to identify suspicious calling patterns. RoboKiller, for instance, maintains a database of over 1 billion known spam and scam numbers and adds millions of new detections weekly. The app uses audio fingerprinting technology to identify when the same spam call is circulating under different numbers.
How to Replace Guitar Pickups Step by Step →
TrueCaller offers a reverse phone lookup feature that identifies unknown callers before you answer. When a call comes in, the app displays information about the caller if that number exists in its database. This helps you decide whether to answer or block the call. Nomorobo, developed specifically to combat robocalls, answers calls on your behalf and listens for characteristics of spam calls, hanging up on confirmed spam before it reaches you. Whoscall provides similar functionality with a focus on blocking spam and identifying unknown callers in real time.
Most of these apps offer both free and paid versions. The free versions typically include basic blocking and caller identification, while premium versions add features like advanced analytics, personalized blocking rules, and detailed call reports. Some apps, like Nomorobo, are completely free. When selecting an app, research reviews on your phone's app store and check privacy policies carefully. These apps need permission to access your call log and contacts to function effectively, so understanding how your data is used matters.
Installation and setup are straightforward. Download the app from your phone's app store, follow the on-screen instructions to grant necessary permissions, and configure your blocking preferences. Most apps allow you to create custom blocking lists, whitelist trusted contacts, and adjust sensitivity levels for how aggressively the app blocks calls. Some integrate with your phone's native call-blocking system, while others route calls through their own servers for analysis.
Practical Takeaway: Third-party apps provide additional protection beyond your phone's built-in features. If you continue receiving spam calls after enabling native filters, consider trying one or two of these apps. Start with free versions to test their effectiveness before paying for premium features.
Behavioral Practices That Reduce Your Exposure to Spam Calls
Your own actions significantly influence how many spam calls you receive. One of the most effective practices is avoiding giving your phone number to unknown sources or untrusted websites. When making online purchases, registering products, or signing up for services, scrutinize privacy policies to see whether the company sells or shares customer data. Many reputable companies pledge not to share phone numbers, while others sell this information as a secondary revenue stream.
Learn How to Rekey a Kwikset Lock Yourself →
Be cautious about which online forms request your phone number. Do you truly need to provide it, or is it optional? Many websites mark phone number fields as required when they're actually optional. Leaving the field blank when possible reduces the number of databases containing your contact information. When you do provide your number, look for opt-out preferences in privacy settings or on the company's website where you can request not to receive marketing calls.
Never respond to spam calls or robocalls, even to press a button to remove yourself from calling lists. Responding confirms that your number is active and monitored by a real person. Scammers and telemarketers then mark your number as a "live" number and may increase calling frequency or sell it to other operations. Similarly, avoid answering calls from unknown numbers. If the caller has a legitimate reason to reach you, they'll leave a voicemail message.
When you do answer an unknown call and discover it's spam, don't engage in conversation, don't answer questions, and don't provide any information. Hanging up silently is appropriate. If you accidentally respond to a scam caller claiming to represent the IRS, your bank, or another organization, end the call and contact that organization directly using a phone number from their official website or your bank statement—not a number the caller provided.
Practical Takeaway: Limit where and when you share your phone number. Review the privacy settings on accounts you've already created and request removal from marketing lists. Never respond