Why Car Insurance Comparison Sites Trigger a Flood of Spam Calls — and How to Stop Them

ByPriya Nair

Your phone didn’t start ringing by accident

If you used a car insurance comparison site this week and your mobile hasn’t stopped since, there’s a reason. The moment you submit your details on certain sites, your contact information can be passed, sold, or auctioned to a chain of insurers, brokers, and data middlemen you’ve never heard of. By the time the first call lands, your number may already be sitting in dozens of marketing lists.

Two very different kinds of “comparison” site

Most people treat these sites as interchangeable. They’re not.

True aggregators — well-known names like Compare the Market or GoCompare — make money from referral fees paid by insurers when you buy a policy. They have a strong commercial reason to protect your data: users who get buried in spam don’t come back. GoCompare, for instance, states explicitly that it does not sell customers’ personal data to third parties.

Lead-generation sites work on a completely different model. They collect your details under the guise of finding you quotes, then sell that information — sometimes to dozens of companies simultaneously, sometimes auctioned in real time. Consumer Reports found that some insurance quote sites share data with hundreds of “marketing partners” buried deep in their privacy policies. The more parties buy your data, the more the site earns. You’re not the customer in this transaction. You’re the product.

The “contact us directly” leak

Here’s the part most people miss. Many comparison sites include a panel inviting you to click through to an individual insurer’s own website, or to call them directly for a quote. When you do that, you’ve left the aggregator’s data environment entirely.

You’re now on a separate site, under that insurer’s own privacy policy, which may allow far broader marketing use of your details. Getting a callback from an insurer’s own site is effectively opting into their full marketing operation — separate from whatever the comparison site promised about your data.

This is almost certainly where a significant portion of those calls originate.

Most comparison sites ask you to agree to their terms and privacy policy before you can get a quote. Some treat that tick as consent to receive marketing calls from any number of partners.

The ICO has been explicit on this point: it doesn’t work that way. Consent bundled into a mandatory T&C acceptance — where you have no real choice but to agree to access the service you want — is not “freely given” under UK GDPR and PECR. The ICO has confirmed that tying marketing consent to service delivery fails the legal test. If a UK-based company is calling you on the basis of that kind of bundled consent rather than a genuine, specific opt-in, they’re likely in breach of PECR. You have grounds to complain.

What UK law actually requires

PECR — the Privacy and Electronic Communications Regulations — governs marketing calls and texts in the UK, running alongside UK GDPR. The obligations on companies are clear:

  • They must not call anyone registered with the Telephone Preference Service (TPS) without that person’s specific, separate consent to receive calls from them
  • Automated marketing calls require explicit prior consent, full stop
  • Every live marketing call must identify the organisation making it
  • Companies must maintain and honour a suppression list of people who have asked not to be contacted

Violations can result in ICO fines of up to £500,000 under PECR. Enforcement is uneven, but the ICO has issued significant fines in this space before — particularly against insurance-related marketing operations.

The TPS: free, and underused

The Telephone Preference Service is the UK’s official do-not-call register. Registration is free at tpsonline.org.uk, or you can text your mobile number to 85095. It takes up to 28 days to take full effect after registration.

Caveats worth knowing: TPS does not stop overseas scam callers, who ignore UK law entirely. It also doesn’t technically cover automated robocalls — a gap regulators have been slow to close. But for legitimate UK-based insurers and brokers, TPS registration means they’re legally obliged to stop calling you, and if they continue, you have a documented complaint path through the ICO that has real teeth.

Regulators are catching up — at least in the US

In the US, the FTC settled with lead-generation company MediaAlpha in 2025 for $45 million over practices that included auctioning consumers’ personal information — contact details, health data, income figures — to third-party telemarketers, some of whom called numbers registered on the National Do Not Call list. A related action against Assurance IQ reached $100 million. The FCC also tightened consent rules in January 2025, requiring telemarketers to get written permission from each consumer for each individual provider, closing a loophole that had let companies use one blanket form to feed data to dozens of buyers at once.

The UK’s ICO has comparable enforcement powers under PECR. Its record is inconsistent, but individual complaints genuinely matter — they build the ICO’s case files and can trigger investigations that a single data point wouldn’t justify.

What you can do right now

  • Register with TPS if you haven’t already — tpsonline.org.uk or text 85095 from your mobile
  • Ask to be added to their internal suppression list when a caller names their company — they’re legally required to maintain one, and this creates a paper trail if they call again
  • Report persistent callers to the ICO at ico.org.uk, especially if you’re TPS-registered and they’re still ringing
  • Before entering your number on any site, search the privacy policy for the phrase “marketing partners” — the length of that list tells you a great deal about what follows
  • Use your phone’s built-in call blocking for numbers that repeat; both Android and iOS have this without needing a third-party app

The volume does tend to drop off after a few weeks. Your data is most valuable right after submission, when it’s fresh and commands the highest price in lead auctions. As it ages and gets resold further down the chain, the calls thin out — though that’s cold comfort when your phone is going off every twenty minutes.

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