How to unlock AT&T iPhone and put Vodafone card in it without paying extra money?

I recently moved to Germany and I wanna unlock my iPhone 4S AT&T keeps telling me I just have to back up and restore the iPhone but every time I do this and want to put in the new sim it says it doesn't work with this SIM card. What can I do?

You can't unlock this iphone for free. But you can get cheap price unlocking solution for your iPhone4S from http://www.prounlocking.com/apple-iphone-4s/rs16wp9/ here they unlocked your iPhone using Remote unlocking method. Which is the safe and secure method to unlock iPhone. Here they unlock your iPhone using latest versions of iTunes.

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