Is she too young for her own iPhone?

A couple of days ago, Jeff's new iPhone 4 came in. Well, apparently, his old phone still works to play with apps and music but it shouldn't make calls anymore. This is big news for Caroline! Now, she has her own iPhone and can play Peekaboo Barn anytime she wants. I don't know. Is this a good thing? If you have an iPhone and a small child and don't have this app, I strongly recommend that you get it. It is truly worth $1.99. Everyone else that I know who has it swears by it. It is the best thing I ever downloaded on Jeff's phone.