Re: My money's on Vodafone being the first to start charging
Not necessarily. I've been with Voda NL for ages and, at least for the contract's I've had, I didn't have to pay roaming charges well before the EU ban on them. But your mileage may vary.
(I know it's not cool to defend Voda, but here in NL they provide a perfectly good service at a reasonable price, and local call centres (though I rarely have to contact them).)