In trying to get a site working on cell phones, I got a “406 Not acceptable” only on the Motorola RAZR. The site loaded fine on my Treo 755 and every Blackberry I’ve tried. It seems that the RAZR doesn’t handle Multiviews very well, or at all for that matter. If you’re using Multiviews and Apache, you’ll have to specify the full URL: so /login.php rather just /login.