I "think" he means having a different HTML layout (ie minimal graphics, no javascript/AJAX etc).
Don't think the old "WAP" mobile standard really made it in the USA - but this is what it was for. Sites like the 'bbc' then detected you were on a cell phone and used the WAP version of their site.
That being said - the BBC have now suspended the WAP versions of their site saying that it was hardly used anymore now that people have smart phones with the same capabilities as pc browsers.