How to Stop Your Phone Number From Being Used by Scammers

You start getting calls from strangers asking why you called them. Or someone tells you they got a call from your number offering a suspicious deal. Your phone number has been spoofed — used by scammers as a fake caller ID. Here’s what’s happening, what you can do, and how to limit your exposure.

How Spoofing Actually Works

Phone number spoofing doesn’t require access to your phone or SIM. Scammers use VoIP services that allow them to set any outgoing caller ID number. They choose real-looking local numbers because people are more likely to answer them. Your number may be used thousands of times without you having any way to stop the spoofing itself — the calls aren’t coming from your device.

What You Can Do About Spoofing

You cannot technically prevent spoofing of your number — it happens entirely at the scammer’s end. But you can mitigate the fallout. If you’re getting callbacks from confused or angry people, record a voicemail message explaining that your number has been spoofed and you are not responsible for calls they received. This reduces distress for the people being targeted.

Report It to Your Carrier

Contact your mobile carrier and report that your number is being spoofed. They can flag the number and in some cases add protections. In the US, file a complaint with the FCC at fcc.gov/consumers/guides/spoofing-and-caller-id. In the UK, report to Ofcom. These reports build the databases that carriers use for call blocking systems.

Protect Yourself From Incoming Spoofed Calls

Enable your carrier’s call-filtering service. T-Mobile has Scam Shield, AT&T has ActiveArmor, Verizon has Call Filter, and EE and Vodafone in the UK have similar services. Many are free. These use real-time databases of spoofed and scam numbers to warn you or automatically block suspicious incoming calls.

Register With the Do Not Call Registry

In the US, register at donotcall.gov. In the UK, register with the Telephone Preference Service at tps.co.uk. These registries don’t stop scammers (who ignore them) but they do stop legitimate telemarketers — reducing call volume overall and making the illegitimate calls easier to identify.

Consider a New Number if Spoofing Persists

Spoofing campaigns typically use a number for a few days then rotate to a new one. In most cases the problem resolves on its own within a week or two. If it persists for longer and is causing significant disruption, asking your carrier for a new number is sometimes the most practical solution, though it requires updating your number with all your contacts and services.

Never Share Personal Information Based on Caller ID

The broader implication of spoofing is that caller ID cannot be trusted. If you receive a call claiming to be from your bank, the police, or a government agency, and they’re requesting personal information or payment, hang up and call the organization directly using a number from their official website. Legitimate organizations never require immediate action that prevents you from verifying who you’re speaking to.

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