To optimize a site to mobile phones is very. No need to submit search engine its all after thing. It's very important to validate a site Xhtml validation. It's te key to get in or to access through your mobile phone. Design is not at all a matter to mobile phones. Use external CCS to design. Optimize the code use whichever used like XHTML, CHTML, WML, etc..,

Accessing is a key part in mobile phone sites. Use a back link.