How to transfer everything from one iphone to another if it isn't new?

My iphone has been having a lot of problems, so my sister gave me her old one. They are both the ipone 4 if that helps. How do I wipe everything off of her old phone and transfer everything from mine onto it?

Put the new one back to defaults, as in erase everything. Sync the old one. Plug in the new one with iTunes running and you will be asked if you want to restore it to the sync. Click yes.

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