You know it really doesn't take that much effort to adapt a site to mobile technology (at least not if you're presenting static images). If you design a site around the XHTML specs you're pretty much going to accomplish compatibility with most cell phones around today. The other side benefit of XHTML is you're going to show up higher on the search engine side of things since it's easier for the spiders to digest your site (at least that's been my experience). Simply make sure your site meets the XHTML 1.0 Transitional doctype and you really shouldn't have too many problems with any mobile devices. Checking your site with validator.w3.org to find out if it meets the spec is the best thing you can do. Example:
http://validator.w3.org/check?uri=www.adultpicweb.com