biellebrunner on "[Plugin: Jetpack by WordPress.com] Mobile theme not working"

I recently changed the theme on my wordpress website, and ever since then Jetpack's mobile theme won't work. Whenever I access my website through my phone, I get the full layout, instead of the simplified mobile version. It's a fairly heavy theme with lots of images, so it can take a while to load the website depending on the person's connection, and I'd really like to have the mobile theme back to functioning. Is there anything I could do to do that? Any code I could insert on the theme, or something?
Thanks.

http://wordpress.org/extend/plugins/jetpack/