title: What resolution should a mobile website be optimized for?
body: <p>I'm having trouble understanding how the mobile resolution works. From what I know, standard website mobile resolution is 320px width. The problem seems to be with iPhone 4, which seems to have 640px width screen resolution, but yet, it displays web in 320px.</p>
  
  <p>What is the solution here? Do I code 2 different resolutions for 320px and 640px screens? How do I force iPhone 4 to display 640px web?</p>