AVG Signal Blog Security Scams What Is Caller ID Spoofing and How to Stop It
Signal-How-to-stop-phone-spoofing-Hero

You can become a victim of spoofing in two different ways: by receiving spoofed phone calls from scammers, or when scammers use your phone number as a disguise when spoofing other victims.

Keep reading to discover what you can do to stop receiving spoofed phone calls and find out how to stop scammers from spoofing your phone number.

This article contains:

    What is phone spoofing?

    Phone spoofing is when someone (usually a scammer) disguises their real phone number with a different number so that the call appears to be coming from someone else. Spoofers typically seek to access personal information or sell an unnecessary service.

    The increase in robocalls has led to many people no longer answering calls from unknown or unfamiliar numbers. Scammers use caller ID spoofing to get around this habit — neighbor spoofing is when a scammer spoofs a number with the same area code as that of their victim. This can fool the victim into thinking the call is coming from a local friend or business.

    Spoofing techniques are not terribly difficult or even illegal to use, so it’s unsurprising that variations such as IP spoofing have become common. Learning more about spoofing is the best way to identify the signs and avoid becoming a victim.

    How does phone spoofing work?

    Phone spoofing usually works by using VoIP (voice over internet protocol) to make phone calls over the internet rather than with traditional telephone networks. With many VoIP services, such as Skype, no further software is needed to successfully spoof a call —you can configure the displayed outgoing number when setting up your account.

    Why is phone spoofing dangerous?

    Cell phone and landline spoofing is dangerous because it leverages social engineering techniques to manipulate victims into revealing personal information or giving money. Manipulation like this is a form of phishing known as voice phishing.

    Consider this phone spoofing example: A scammer learns which charities their target supports, and then uses spoofing to appear to be calling from the charity’s actual number. The spoofer might claim that they are calling to confirm the victim’s contact info before asking for a charitable donation.

    In a similar scenario, a scammer may place a spoof call appearing to come from the IRS. Under this pretense, they might try to convince their target to reveal personal information such as their social security number. Afterwards, the path to identity theft and fraud is much easier for the scammer.

    It’s a massive red flag when anyone asks you for your social security number — but spoofing scams aren’t always that overt. The spoofed call could appear to be coming from an IT help desk, with the caller asking you to answer security questions to verify your identity before connecting you to an agent.

    If a hacker gets this personal information, they can use it to answer your security questions on other sites or increase their chances of cracking your passwords.

    How to stop phone spoofing

    There are a number of techniques you can use to stop spoofed calls. Some of the techniques used to stop robocalls can also help fight spoofing. Start with these steps:

    • If you’re in the US, file a claim with the FCC (Federal Communications Commission) and report unwanted calls to the FTC (Federal Trade Commission).

    • If you don’t recognize the number of an incoming call, don’t pick up. And if you get a one-ring call, do not call the number back.

    • Avoid giving out your phone number online. If it is not required in an online form, don’t fill it in.

    • Remove your phone number from social media profiles.

    • Manually block numbers on your phone that come from unwanted calls.

    • Trust your instinct; if the caller’s tone seems strange or they ask for personal information, hang up.

    • Avoid online sweepstakes or raffles — these sites often sell personal data, such as phone numbers.

    These tips can help you identify and stop spoofed calls on your phone, but you should also take additional precautions. A free mobile security app like AVG AntiVirus will help protect you against scams and malware that targets mobile devices.

    How to block spoofed calls on Android

    Not every Android device works the same, but there are generally two ways to block unwanted calls on an Android phone: using the phone app or the recent calls log.

    Block spoofed calls on Android through the phone app:


    1. Open the phone app and tap the three vertical dots in the top right.

      Home screen of phone app on an android phone, three vertical dots in the top right are highlighted.
    2. Choose Settings from the drop-down menu.

      Drop down menu open in the top right of phone app on android with "Settings" highlighted on the menu.
    3. Choose Call Blocking from the Settings menu.

      Phone settings menu page with call blocking highlighted.
    4. Add the number you want to block to prevent them from calling or texting you again.

      Blocked numbers page within the option to block a new number highlighted. Previously blocked numbers would be displayed here.

    Block spoofed calls on Android through recent calls


    1. Open the phone app and go to your history or recent calls.

      Phone app open on android phone and the tab with recent call history is displayed.
    2. Tap a recent spoofed call to see a drop-down menu.

    3. Choose Block number.

      Recent call from call history tapped to reveal a drop down menu, with block number option highlighted.
    4. Choose Block again from the pop-up window to confirm.

      Pop up on phone asks the user to confirm to block the specified number with 'block' button highlighted.

    How to block spoofed calls on iPhone

    You can block spoofed calls on iPhone in the recent calls log or in the Contacts section of the phone app.

    Blocking recent spoofed calls on iPhone


    1. Open the phone app and tap Recents.

    2. Tap the small information icon next to the number.

    3. Scroll down and tap Block this Caller.

    Blocking a stored contact on iPhone


    1. Open the phone app and tap Contacts.

    2. Select the contact you would like to block.

    3. Scroll down and tap Block this Caller.

    How to send unknown callers directly to voicemail

    iPhones give you the option to send unknown callers and spam directly to voicemail. Calls from people in your contact list and recent outgoing numbers will still come through as normal. To activate this setting:

    1. Tap the Settings icon, then scroll down and tap Phone.

      Opening the Phone settings in the Settings app for iOS
    2. Tap Silence Unknown Callers.

      The Phone settings in the Settings app for iOS
    3. Toggle the switch to On.

      Silencing unknown callers on iOS

    How to tell if your phone is spoofed

    You’ll know your phone number is being used for spoofing if people you don’t know begin calling or texting you to ask why you called them or who you are. Understandably, they might appear frustrated and ask you to stop contacting them.

    Scammers need to use legitimate phone numbers to disguise their own, so your phone number might end up as someone else’s spoofed caller ID.

    What to do if your phone number is spoofed

    If your phone number is spoofed, there are several steps you can take to make things easier:

    • File a claim with the FCC if you live in the US.

    • Record a new voicemail letting callers know that your number is being used by scammers without your permission and ask them to be wary of calls coming from your number.

    • If you have an iPhone, you can use the built-in setting to silence unknown callers, as described above.

    • Use an app to temporarily block all calls from outside your contact list.

    Scammers tend to cycle through phone numbers quickly to avoid being detected. And if your number is being used for a neighbor spoofing strategy, it will likely be abandoned once the scammer has moved on to a new area code.

    Protect your phone with AVG Antivirus

    With cybercrime frequently making headlines, it’s easy to forget that offline actions like phone calls remain popular with scammers. Learn the tricks of spoof calling so that you can spot the signs and know how to respond.

    But spoofing isn’t the only threat out there targeting mobile devices. AVG AntiVirus for Android runs silently in the background, scanning apps and games to find and remove any malicious content. It also provides an anti-theft tracker that helps you locate a lost phone and even wipe the private data if you think it’s unretrievable.

    For those using iPhones and iPads, AVG offers a powerful mobile privacy app for iOS that goes beyond antivirus. It has the ability to encrypt private photos, check unsecured Wi-Fi connections for safety, and even warns you if your password has been leaked in a data breach.

    The decision to answer a phone call is always yours, but with Mobile Security app for iOS, your mobile devices will be protected against threats both online and off.

    Stop spoofing attacks with AVG AntiVirus

    Free install

    Get unmatched protection for your iPhone with AVG Mobile Security

    Free install