Re: My money's on Vodafone being the first to start charging
"Obviously, you have the option of buying an international call add-on that gives you a call allowance for selected countries."
Yes, but have you seen:
(a) how much vodafone charge for such add-ons
(b) how little you get for paying vodafone your £5 a day
(c) the vodafone conditions for the above which carefully carve-out all sorts of things.
I travel extensively and getting your hands on a local SIM card is pretty much always better value for money than throwing £5 a day down the drain at Vodafone for their "Business Traveller" package for example.