I plugged my iphone into the computer and it erased everything?

I plugged my iPhone 4G in because it did the cord to plug into itunes and it said "Restore IPhone" so i clicked that and then it REPROGRAMMED my whole phone into my younger sisters ipod settings! All HER contacts and information is now on my phone! HOW DO I GET MY STUFF BACK!

Buy a lumia 920.

After restore iPhone, all your personal data like pictures, messages, contacts will be erased.
But don't worry! Though iPhone uses quite a different storage mechanism, still you can recover deleted or lost data (such as text messages, contacts, photos etc) with a third party specific iPhone data recovery software tool.

http://www.iphone-data-recovery.net/iphone-data-recovery-tool.html

Hope it helps!

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