Being new to mobile developing, I was pleased at the ease of development with asp.net using the mobile controls.  First app worked like a charm, until someone with a Samsung E715 tried it.  You get a very generic "Not Found" error.  What should I be doing in the event of an unknown device?  Is there a default type of page that is rendered (wml,xhtml)?

further notes: the samsung phone uses WAP 2.0; this phone was also not recognized by Request.Browser["IsMobileDevice"]; the page I am trying to load is a reentry page that loads correctly the first pass, but on the second pass when query string variables would be present, is when it errors; there is no authentication being used.