Why does my iphone 4s setup look different?

My mom just bought me and my sister new iphone 4s but we realized things were setup differently as the default, her's started with a youtube and my didn't and when you go to her app store the things you can look at are featured, top charts, categories, search, and updates.mine is the same except for categories i have to go somewhere different to see those and instead of categories being down there there's a genius feature instead. I wanna know why mine is different.

This always happens with fake iPhones.

One is running iOS 5 and the other is running iOS 6. When she upgrades her iPhone to iOS 6 (Settings > General > Software Update), then the App Store will change to be like yours and the YouTube app will also be removed. (There's a new one in that replaces it, but you have to download it from the App Store.) Basically, your iPhone is running a newer version of Apple software.

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