im not sure about transfering it yourself, but your cell carrier can most likely. cingular did it for me, they transfered all contacts.

Hello everybody,

I have a samsung t809. I am trying to transfer my contact #s from the phone to simcard. I pretty much looked at every option on the phone. On the phone it has the ability to transfer simcard to phone but not phone to simcard. This is very annoying because I'm trying to get my phonebook into my new phone I just purchased. Its no fun manually readding 173 contacts onto a new phone. If anyone knows how LMK. Thanks!