Does your website use separate mobile URLs, for example m.example.com for mobile pages and www.example.com for desktop pages?
Google’s John Mueller said on Reddit that websites with separate mobile URLs should just move to a responsive website design:
“With mobile first indexing, I’d recommend integrating the mobile version just as well as you would the desktop version. That means adding the alternate-amphtml link to the mobile version (pointing at the amp version), and including a reference to the mobile version from the amp version.
That said, at some point all of these sites with separate mobile URLs should just move to a responsive design anyway, which makes all of this moot. (Separate mobile URLs makes everything much harder than it needs to be.)”
Google can handle separate mobile URLs. However, Google recommends responsive web design because it is much cleaner and easier to maintain than other methods.
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