Hoping some of you experts can help me out here...

My wife currently has a 3G, I've got a 3GS. I'm eligible for upgrade on 6/20 so I'm going for the 4G/HD/whatever-they-end-up-calling-it.

Question: can I "upgrade" my wife to my 3GS by simply swapping out her SIM card? Will all of her contacts/apps/info switch over with a clean restore using her old SIM?

Thanks in advance!