WordPress Mobile Pack: Mobile Switcher

I’m trying to set up “Domain mapping” using the WordPress Mobile Pack plugin.

I created the sub-domain, m.whatever.com on my host and entered it into the mobile domain field, however, it’s not redirecting to that domain when accessing the website on a mobile device.

What step am I missing?

Thank you in advance!

http://wordpress.org/extend/plugins/wordpress-mobile-pack/