how do you have your site default to the mobi version when called up on mobile device

this may be a dumb question...

does anyone have a quick tutorial on how to make a your site, default to the mobile version of it..when viewed on an iPhone or whatever mobile device??

I have the mobi domain.

I am just confused how to make my site come up in the mobile version when viewed on an iPhone..instead of the web version..

thanks mates.

I presume you could use this to redirect mobile users to your .mobi domain? (or the mobile version as you said) -

http://detectmobilebrowsers.mobi/

This might help you
http://css-discuss.incutio.com/?page=HandheldStylesheets