It seems in Giuliana only Wind has 3G coverage (quite unusual!). TIM should have EDGE, while Vodafone only GPRS. 3 has no coverage at all.
Wind and TIM should have 3G coverage also in Sambuca di Sicilia and Bisacquino.
Both Wind and TIM have data offers, all information here:
http://www.prepaidgsm.net/forum/ital...ata-italy.html