I attempted to implement this on my beta-blog tonight with no success. I composed a message on my phone, sent it, then tried to run your script through my browser rather than setup a cron job at this point. I was greeted with the following error message:
Fatal error: Call to undefined function: imap_open() in
home/wantm00r/public_html/wordpress/wp-moblog.php on line 34
I tried removing the /notls that I saw a note about somewhere on your WP blog. Is this a function that should've been included in the PHP installation on my web server?