Originally Posted by Mjonno10
Basically, I know you're supposed to keep your internal memory as free as possible.
So is there a way of saving all my contacts/messages to my 16g Memory card?
No, you can't. They remain in the phone memory.
The external card is primarily used for media (pics, music, ringtones). You may also save documents on it but you can't store the items such as contacts & messages on it (except by using a work around as suggested by the other poster to create a copy in a document).