Switch sim card from old phone into 3GS?

Will it void my iPhone warranty if I take the sim card from my old phone (Nokia E62 if that matters) and put it in my new 3GS? I'll still have the data plan attached to my AT&T account, right? I want to switch sim card so I have all my contacts, but not if it will mess up my new iPhone.

You need to use the SIM that comes with the iphone and get the iphone plan. IPhone and it's SIM are "married" for lack of a better term.
You can import the contacts from your SIM into the iphone.
http://manuals.info.apple.com/enUS/iPhone_UserGuide.pdf

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