It may not be Xara but your iPhone. I have a site that has 2 sites, one for mobiles and one for desktops. There is code in the .htaccess file to serve up the correct variant. It works well on all the Android phones I've tested it on and in 6 of the 7 iPhones I've tried. The 7th one however serves up the Desktop pages. I can only summise tat their may be an option on this phone to bring up the full scale site.

Try it on friends mobiles and see what you get.