Add a custom stylesheet for BlackBerry

Well… You’ve already used wp_enqueue_style. Use it again. That is the canonical mechanism for loading stylesheets either by itself or in combination with wp_register_style

wp_enqueue_style('blackberry',get_stylesheet_directory_uri().'/path/to/blackberry.css');

I feel compelled to note that user agent sniffing is not especially reliable. Is it not possible to do this with media queries?

Reference

http://codex.wordpress.org/Function_Reference/get_stylesheet_directory_uri

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