IPhone 3GS Pay & Go using Pay Monthly sim

I read online - from O2's site I believe - that I can purchase an iPhone 3GS on Pay & Go, and use my pre-existing 3G sim card and receive full functionality. I have just ordered an iPhone 3GS from the Online Apple Store. Will I be able to do this without any problems? Thanks.

Hi
I did this
i had the 3g then got the 3gs and gave the 3 g to my wife wo is on o2 contract she had nearly everything except visual voice mail and teathering ...hope this helps
( she is on a standard o2 contract with unlimited internet bolt on, im on the iPhone plan )

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