Can I undo a backup on an iPhone?

I just bought an iPhone 4S, but I had an iPod prior to that. When I connected the iPhone to iTunes on my computer, I clicked "restore from backup" without even thinking about it. I had gotten the guy at the store to transfer all my contacts, and they all got deleted when I restored. I really hadn't meant to do that. Is there a way I can undo it, and get my contacts back?

Nope:/

You sure can… You just need to talk to all the contacts in person or by phone to get the information again.

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