I have some questions about facebook and iphones/blackberry's, can you help?

I don’t have an iphone or blackberry, but I want to know what sorts of updates they can get from facebook.

Can they receive everything? All status updates from everyone of your friends who updates a status, or only what someone posts directly to your wall or inbox?

Also, if I post something, and someone with a blackberry has it set to receive facebook updates and posts to threads, but then I change my mind and delete the post, can they still see it in their phone? Does it not erase on the phone, even though you have deleted it on facebook, and no one can see it on facebook anymore?