My parents just got my an iPhone 4S and I don't know how to sync my contacts from my old phone, which was not Apple, to my new iPhone
you have to get your old phone to sync it's contacts to a program on your computer
such as outlook or address book if you use osx
or google even
and then choose that source to sync contacts with the iphone when you connect it to the computer
and click on the info tab on the iphone icon located in the sidebar in itunes on your computer
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