Will an iphone 3gs sim card work for an iphone 4 if i cut it?

My dad has an an unlocked iPhone 3GS and has no data plan, just texting and calling. I want to give him my 4, which is not yet unlocked. Can he use it if he cuts his sim card to fit into an iPhone 4? And will they charge him if he uses the internet?

DO NOT CUT THAT SIM CARD. It takes away all the value and renders it useless. You can buy sim cards for less than 5 dollars.whatever you do DON't CUT IT

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