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Vodafone Italia is clarifying their permitting of VoIP, or when they'll block it.
In Spain and France I've noticed how some of the mobile operators were blocking Skype and SIP calls over their date networks. It seems to be impacting the pre-paid market more than the contract market, but in the case of Vodafone Italia they are being very clear in defining which customers can, and which can't place or receive Skype or VoIP calls.
My feeling is that this is really a pre-cursor to what the mobile operators will permit when LTE rolls out on a global basis.