1. Will desktop and/or tablet ranking also be affected by this change?
No, this update has no effect on searches from tablets or desktops. It affects searches from mobile devices across all languages and locations.
2. How do I know if Google thinks a page on my site is mobile-friendly?
Individual pages can be tested for “mobile-friendliness” using the Mobile-Friendly Test.
3. Does Google give a stronger mobile-friendly ranking to pages using Responsive Web Design vs. hosting a separate mobile site?
No, mobile-friendliness is assessed the same, whether you use responsive web design (RWD), separate mobile URLs, or dynamic serving for your configuration. If your site uses separate mobile URLs or dynamic serving, Google recommend reviewing the Mobile SEO guide to make sure Google is properly crawling and indexing your mobile pages.
4. Unfortunately, my mobile-friendly pages won’t be ready until after April 21st. How long before they can be considered mobile-friendly in ranking?
Google determine whether a page is mobile-friendly every time it’s crawled and indexed — you don’t have to wait for another update. Once a page is mobile-friendly, you can wait for Googlebot for smartphones to naturally (re-)crawl and index the page
5. What if my audience is desktop only? Then there’s no reason to have a mobile site, right?
Not exactly. Statistics show that more people are going “mobile only” — either because they never had a desktop or because they won’t replace their existing desktop. Additionally, a non-mobile-friendly site may not see many mobile visitors precisely for that reason.
The mobile-friendly update will apply to mobile searches conducted across all sites, regardless of the site’s target audiences’ language, region, or proportion of mobile to desktop traffic.