Hello! I'm looking to purchase an iOS device for my girlfriend. I was hoping to use the same iTunes account on it, so that we don't have to repurchase music or apps in the future. How would this affect our ability to use iMessage, FaceTime or Game Center between our devices? For example, would we be able to play Game Center games with each other? Has anyone tried using one iTunes Account between multiple people? Thank you for any help you can give.