If your website redirects mobile users to any page other than the mobile version of the exact page requested by the mobile browser, you are doing it wrong.
This is bad
www.example.com/article redirects to m.example.com
This is worse
www.example.com/article returns an error
This is best
www.example.com/article returns m.example.com/article – a mobile optimized version of the page ...Continue Reading...