Synced wrong ipod information into new iphone?

I just got a new iPhone today and i plugged into my computer and opened itunes to sync all of the things i had on my iPod touch to my phone. My sister has an iPod also and all her things loaded on to my phone by accident. How do i take all of her stuff back off and sync all my iPods stuff on my phone? I had my contacts set before i synced and now they are all gone and it uploaded my sisters contacts. Is there anyway i can undo all that was just loaded and sync my stuff on instead?

You need to erase all the information on it and re-sync it with your iPod. The reset button is in the same place as the sync button (on the iPhone screen in the bottom right corner)

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