Guide
A site can genuinely show something different on a phone than it does on a computer. Google mostly only looks at the phone version — whether or not you've ever actually checked what that looks like.
See it for yourself
Sonshine Glass & Mirror's old site, and their current one — both recorded on an actual phone screen, not a browser resized to look smaller.
2021: nothing about how to call or get a quote shows up until you scroll.
Today: a way to request a quote is visible the moment the page loads.
Neither site is "broken" — both load fine on a phone. But loading fine and actually making it easy to reach the business are two different things, and most business owners have only ever looked at their own site on the computer they built it on.
Why this actually matters
On a phone, a business's number can be set up as an actual button — tap it, and the call just starts. Someone standing in front of a leaking window doesn't have to remember a number, switch apps, or type anything. That doesn't happen automatically; it has to be built that way on purpose.
A short form built for a small screen means someone can ask for a quote right then, standing in their kitchen — not "later, at a computer" they may never get back to. Tiny text boxes and dropdowns that are hard to tap turn a two-minute form into a five-minute fight, and people give up.
Why Google cares which version you see
Google has said this directly: it looks at the mobile version of a site — not the desktop one — to decide what shows up in search results. Google finished rolling this out across every site on the internet in October 2023. In practice: if a phone number or a way to ask for a quote is missing, buried, or broken specifically on the phone version, that's the version Google is judging — no matter how good the site looks on a computer.
What a slow phone experience costs
Google's own data: as a page's load time on a phone goes from 1 second to 10 seconds, the chance someone leaves before it finishes loading goes up 123%. More than half of mobile visits get abandoned once a page takes longer than 3 seconds.
Google has published real examples of businesses that fixed a slow mobile site: one saw mobile signups roughly double, another saw a real jump in mobile orders, a third cut how often people left immediately nearly in half. These aren't hypothetical — they're what changed once the mobile experience actually got fixed.
Why this happens
It's natural — the site gets built and reviewed on a laptop, because that's what the business owner and whoever built it are both looking at during the process. Nobody opens it on their own phone afterward, mostly because there's no reason to; the site already looks "done." That's exactly how a phone number ends up buried, or a quote form ends up too small to tap correctly, for years, without anyone noticing.
Common pitfalls
Resizing a browser window on a laptop isn't the same as loading the real site over a real phone connection.
If the number on the page isn't set up as a tap-to-call button, someone has to copy it, switch apps, and dial it manually — and a lot of people just won't.
Tiny fields and dropdowns that are hard to tap turn a quick form into a frustrating one, and people give up halfway through.
It doesn't. Google looks at the phone version specifically — that's the one that has to actually work.
The difference
A tappable phone number, a quote form that actually works with a thumb, a page that loads fast on a real phone connection, not just fast office WiFi — that's not an afterthought, it's the starting point. See what that looked like for a real client
The paid diagnostic checks your real mobile experience — including whether your phone number and quote form actually work — alongside your search visibility.