It would be nice if gnome-phone-manager could some day download all SMS messages from a phone, store them on the computer, and then later upload them to a phone. This would be helpful when migrating from an old phone to a new one.

Phone numbers can be transferred with SIM card so up/downloading them is not that necessary but that would be nice feature, too. 

Nokia PC Suite can do this and xgnokii also seems to capable of doing that.