Site displays poorly on iphone

Remove or comment out this code in your functions.php file –

/** Add Viewport meta tag for mobile browsers */
add_action( 'genesis_meta', 'add_viewport_meta_tag' );
function add_viewport_meta_tag() {
echo '<meta name="viewport" content="width=device-width, initial-scale=1.0"/>';
}

You may need to remove the responsive code at the bottom of your style.css file as well……but only do so if its needed.

/* Responsive Design
------------------------------------------------------------ */

I just checked in my browser (which is the only way I can use my tools to debug) and it still shows the responsive code.  Once you remove the code from the functions file it works for mobile browsers, but it looks like you would need to remove the responsive css code as well for desktop browsers.