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Hi There, I'm so sorry, but I've never marketed a business in the UK or Ireland. If you don't receive a response from a UK marketer in the community, I recommend taking your question to Google's own Google My Business forum: https://www.en.advertisercommunity.com/t5/Google-My-Business/ct-p/GMB You are certain to get an answer there.

The answer given by Dirk is correct. In the hreflang annotations you can indicate whatever URL, no matter it is on a subdomain or different domain name.

Hey Massimliano, I responded to you over here too, but basically: Googlebot's user agent declares itself to be an iPhone, so I'd rel="alternate" over to your iphone.site.com version. Rel="alternate" is supposed to redirect based on the width of the screen, not the device type, so I don't know how you'd differentiate between your multiple rel="alternate"s otherwise. I've never heard of anyone using this set up before, so let us know how it goes! Kristina

Hi Massimilano, Whoa, I've never heard of anyone creating a separate URL for every type of phone. There aren't that many differences between iPhone, Android, and Windows Phone browsers, so I'm surprised you're putting in the time to create one of each. If you don't mind me asking, what made you decide to build your site like this? In terms of SEO, though, here's what I'd do: make the iPhone version of your site the rel="alternate," since Googlebot calls itself an iPhone. When Google sends mobile visitors to the iPhone version of your site, just redirect them based on their device type. Hope this helps! Kristina

Had a lot of experience with this... What you need to know here is: A. ) Remember that Google will always see/cache the page as seen by user without any cookie. B. ) This is an acceptable method of doing thing (personalization is allowed) but I wouldn't create 2 totally different content pages here. Small changes are fine but anything major can be considered as "hidden content". C.) As a rule, using different URLs is better for SEO (but maybe not for conversion) For example, I had a site that used cookie for language setting - simply spreading the whole content over unique URL improved organic traffic by+100% (and we are talking many thousands here). Not saying this is you case, because your description sound more like a landing-page optimization, but  wanted to mention this for any future thread readers. GL

It's embedded CSS, correct. Thanks!

Google doesn't store cookies when it indexes your site, so it will "see" your page as someone who hasn't visited before. Perhaps there's another way to look at this.  How about redirecting all user-agents except googlebot to achieve what you want?  Then you'd keep the redirect you want and your rankings!

Yannick is correct. Bing for example will lose trust in your site and start to ignore your tags if you are not honest. Bing has also stated that a canonical is much like a 301, only it leaves the useer on the page, it does not redirect. So yes it will leak a bit of link juice. Read the link yannick supplied, it explains it all.

The 100 link mark is no longer a valid milestone. You can see the Matt Cutts webmastertool video on this subject at : http://www.youtube.com/user/GoogleWebmasterHelp#p/u/4/l6g5hoBYlf0 Hope it helps.