How to unlock Iphone 4S Sprint to different country carrier?

One month ago i bought new Iphone 4S Sprint on Ebay in USA. I live in Italy and need to use it on "Wind" carrier (GSM). All this time, i try to find a help from someone with unlocking, i contact Sprint support, they tell me that i have to be their customer (i never activated iphone with sprint sim card, i don't have it), they told me to contact local apple service, local servis tells me that only Sprint can unlock their phone, and this way i run around. Can someone tell me an advice who do i have to contact for it?

thank you to everyone, who will take trouble to tell me something helpfull

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