How Robocalls Work and How to Stop Them
Robocalls have become one of the most widespread nuisances in modern telecommunications. Billions of automated calls are placed every month, and many of them are designed to scam unsuspecting recipients out of their money or personal information. Understanding how robocalls work is the first step toward stopping them.
What Are Robocalls?
A robocall is any phone call that delivers a pre-recorded message instead of a live person. While some robocalls are legitimate, such as appointment reminders from your doctor or school closure notifications, the vast majority are unwanted spam or outright scams.
How Scammers Get Your Number
There are several ways robocallers obtain your phone number:
- Auto-dialers: These systems can generate and dial thousands of numbers per minute, often calling random sequences until they reach a live person.
- Data breaches: When companies suffer security breaches, phone numbers from their databases end up for sale on the dark web.
- Purchased lists: Data brokers compile and sell lists of consumer phone numbers gathered from public records, surveys, and online forms.
- Number harvesting: Bots scrape websites, social media profiles, and online directories to collect phone numbers.
Legal vs. Illegal Robocalls
Not all robocalls are illegal. Political campaigns, charities, and businesses you have an existing relationship with may legally send automated messages. However, robocalls that attempt to sell you something without your prior written consent are illegal under FTC regulations. Scam robocalls impersonating government agencies or companies are always illegal.
The Technology Behind Robocalls
Modern robocalls rely on Voice over Internet Protocol (VoIP) technology. This allows scammers to place calls over the internet at virtually no cost and from anywhere in the world. VoIP also enables caller ID spoofing, where the displayed number is faked to appear as a local or trusted number. This makes it extremely difficult to trace the true origin of the call.
5 Ways to Stop Robocalls
- Register on the Do Not Call list: Add your number at donotcall.gov. While this will not stop illegal callers, it reduces calls from legitimate telemarketers.
- Use your phone built-in spam filter: Both iPhone and Android devices offer call screening and spam detection features.
- Install a call-blocking app: Apps like Truecaller, Hiya, and RoboKiller can identify and block robocalls automatically.
- Enable carrier-level blocking: Most major carriers offer free or low-cost spam call protection services.
- Never answer unknown numbers: If a call is important, the caller will leave a voicemail. Answering confirms your number is active and may lead to more calls.
Look Up Suspicious Numbers
If you receive a robocall from an unknown number, do not call it back. Instead, look it up on WhoCalledMe.io to see if other users have reported it as spam or a scam. By checking and reporting suspicious numbers, you help protect the entire community from robocall fraud.