Running ads · By Grant Epley · Updated September 17, 2026
Why is a different phone number showing on my website?
By Grant Epley · Updated September 17, 2026
Because someone turned on call tracking. A script swaps the number showing on your website for visitors who arrived from an ad, so calls trace back to the ad that caused them, and the different number forwards to your real line. Call it from your phone and check it rings. Nothing swaps it until it is installed.
A tracking number stands in for yours, and it forwards to you
Call tracking swaps the number on a page for a different one, then forwards every call to your real line. The swap happens in the visitor's browser, so two people can open the same page and see different numbers. It is not a hijack, and your line has not moved.
The point is to tell calls apart. A phone call arrives with no record of what sent it. Give visitors from your ads their own number and every call that comes in on it can be traced back to the ad, the campaign, even the search that started it. Without that, Google cannot count calls as conversions, so it cannot aim your budget at the ads that bring them.
Your real number still does everything it did. The tracking number is a front door, not a replacement. Calls ring the same phone, and Google says caller ID still works on calls routed through its forwarding numbers, except on some calls in India and Japan.
For example
A roofer clicks his own Google ad to see how it looks, lands on his site and finds a number he has never seen. A neighbour on the same page, arriving from a Google search result, sees the number that has been on the van for nine years. Both numbers ring the same phone.
Check it reaches you, then find out which system is swapping it
Do this first, before you change anything. It takes a couple of minutes and it settles whether the number is yours.
- Call the number from your own phone and check the right line rings.
- Answer it and check your caller ID shows the caller's number, not a number you do not recognise.
- Open your site in a private window with no ad click behind it. You should see your own number. If the strange number shows there too, it is not ad-based call tracking, and it belongs to whoever set up your site.
- In Google Ads, open Admin, then Account settings, and look at Call reporting. On means Google is putting its own number in your ads.
- Ask whoever runs your ads or your website which call tracking they installed. If nobody knows, look for a call tracking script in your tag manager or in the site's header.
If it does not ring your line, turn off whatever is swapping it and put your own number back while you sort it out. A tracking number that does not forward is the one real failure here, and it costs you calls.
Three systems swap numbers
In your ads, Google swaps it by default
Google Ads has an account-level setting called Call reporting. When it is on, Google puts one of its own forwarding numbers in your call assets, your location assets and your call-only ads, and routes those calls to your business number. A new account has it on, so this happens whether or not anyone chose it.
The number is chosen to look local. Google matches your area code or prefix where it can, uses a local prefix for your region otherwise, and falls back to a toll-free number when no local one is free.
It costs nothing extra. A tap on the number in your ad is charged as a click, at the same cost as a click through to your site. Google says it does not charge for calls to a forwarding number that someone dialed by hand.
Turning it off is one switch, under Admin, then Account settings, then Call reporting. Your own number goes back in your ads within about a day. You also lose the call details report and Google stops counting calls from ads as conversions, which leaves automated bidding blind to your best lead source. For Smart campaigns the switch does not apply: Google says a forwarding number is mandatory there, in every country that has them.
What happens when someone saves the number and calls back later
A caller who has already reached you keeps working for 60 days. Google says calls still connect for 60 days after the first one, and each new call resets that window.
Someone who writes the number down without calling has a much shorter run: Google routes that first call for about 30 minutes after they saw the ad, up to about 2 hours in some markets. After that it does not connect. This is the reason Google tells you never to print or publish a forwarding number anywhere.
One more trap worth knowing: Google says its call tracking is incompatible with early media, the phone systems that play a menu or a message before the call actually connects. On those systems calls can be reported as missed.
On your website, Google's free snippet swaps it only if someone installed it
This is the one that changes the number on your own pages. Google calls it website call conversion tracking, and it costs nothing, but it does not exist until somebody sets it up.
What it takes. The Google tag on the site, plus a phone snippet on every page where your number appears, with your number typed exactly as it is displayed. The snippet swaps in a Google forwarding number for visitors who arrived from an ad, and a call counts as a conversion once it lasts as long as the minimum you set.
What it will not do. Google's default snippet tracks one number per page, so a site with a different number per location needs more work. It only swaps for visitors from your ads, so calls from an unpaid search result, your Business Profile or a flyer all stay on your own number and stay uncounted.
Third-party call tracking swaps it for more than ads
Tools like CallTrackingMetrics and CallRail do the same job with their own numbers, and they go further: they can give a different number to visitors from paid search, unpaid search, a mailer or a referral, so you can compare sources against each other rather than just measuring ads.
How it works. Their JavaScript sits on the site, reads how the visitor arrived, and swaps in a number from a pool it manages. The visitor's source is kept in a cookie, so they keep seeing the same number on a later visit. CallTrackingMetrics can also vary the number by where the visitor is.
What to watch. Run one call tracking script, not two: CallTrackingMetrics says a second one interferes with its own. Anything that blocks cookies, including a consent banner that a visitor declines, makes the attribution less reliable. And unlike Google's snippet, these are paid tools, which buys you recording, routing and reporting that covers every source.
Your listings and your local search
Keep your own number on your listings
Whatever swaps the number on your site, the number on your Business Profile, your directory listings, your van and your invoices stays your own.
Never publish a Google forwarding number. Google says they are "property of Google" and "can change or be reassigned", and that they cannot be used outside call reporting and website call conversions. Put one on a listing and it may stop routing to you without warning. The 30-minute rule makes that worse: a forwarding number copied somewhere is dead to anyone who calls it later.
A number from a call tracking tool is different, because it is yours for as long as you pay for it. Google's Business Profile rules still apply: the number has to connect to that location and be under the business's direct control, so route it to the same line. You can also list up to two extra numbers alongside your main one.
The swap does not break your local search on its own
What matters for local search is that your business shows one consistent number across your listings. A script that shows a tracking number to a visitor who came from an ad does not change what is in your listings.
The vendors say search engines see your real number. CallRail says its script serves the same code to people and to bots, and that its method will never show a number in a way that puts your listing consistency at risk. That is the vendor's own position rather than Google's, so treat it as a claim, not a guarantee.
If you want calls from unpaid search counted too, the honest way is to make one tracked number your real number: port your line into the call tracking tool, or take one of its numbers and use it everywhere. Then every listing agrees, and you can still hand visitors from each source their own number.