I know the article sort of touches on it but I only recall WAP as being a sort of mark up language akin to a mobile HTML rather than a network layer protocol. My old site (probably late 90s) had a wap.mysite.com subdomain which I hosted them on and which seemed to work well on my limited testing - I don't recall setting anything special up with the hosting - just the same hosting as the regular site. It worked very well on the contemporary mobiles but did I miss something back then?