Use Your Phone from Home
Italy uses GMA technology, like AT&T or T-Mobile phones stateside. Other U.S. carriers, like Verizon, largely use CDMA technology but offer GMA phones to international travelers. If your phone operates on GMA technology you can probably replace the SIM card and use it in Italy.
UNLOCK your phone prior to coming: Call your carrier to make sure your GMA enabled phone is “unlocked” before traveling overseas. Tip: Try to avoid monthly plans as they do not have a military clause.