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I do this by using the personal hotspot's on my 4S to then connect my iPad2 to get the 3G from my phone.
Works very well I think. Saved my buying the £100 extra 3G iPad and then the £10 monthly contract for the 3G signal.
I am however not sure if it will work from the way you are asking. Which you may end up playing the ps3 over 3G.