Googlebot-Mobile can detect clocking, even if you are not guilty, this is depending of how you redirect your users.
Do not ignore Google’s mobile bot. It could notice duplicate content too (between desktop content and mobile version).
So, consider the “Googlebot-Mobile” User-Agent.
This simple diagram can help you:
Official Google Webmaster Central Blog: Running desktop and mobile versions of your site.
Tags: google, mobile, mobile seo, seo