I've been looking on several other forums and I haven't been able to find any SMS verification services with Italian numbers; in fact, I haven't found anything about numbers from Italy except for free numbers which I assume won't work for you. The
services section is your best bet, as Potato Chips linked above.
IMHO escrow isn't totally necessary as I know most SMS verification services charge just a dollar or two for most countries, and that's not a large amount of money to lose to me personally, but if it's a big deal to you, then by any means use escrow. The problem is that 99% of reputable forum escrows have a relatively high minimum escrow amount compared to the cost that most SMS verification services charge.
You could also make a WTB post in the
Digital Goods section. I feel that's the other relevant board for finding SMS verification besides Services on this forum, and Digital Goods gets a relatively high number of visitors on this forum.