Google's Gary Illyes said on Twitter this morning that you can prepare for the mobile-first index which likely isn't launching until next year by looking for noindex directives and faulty redirects.
Here is Gary's tweet from this morning:
Wanna prepare for the mobile first index? Go to your or your clients' mobile sites and look for noindex directives and n1 redirects pic.twitter.com/Pe3LWvuZOt
— Gary Illyes ᕕ( ᐛ )ᕗ (@methode) June 26, 2017
Wanna prepare for the mobile first index? Go to your or your clients' mobile sites and look for noindex directives and n1 redirects
The n1 redirects are the same thing as faulty redirects as described here and over here.
Truth is, any SEO who works on a site already does this, so this isn't really new.
Forum discussion at Twitter.