I am going to be in Spain for 12 days starting in late June. We have a hacked iPhone that I have used for travel before. What we need to figure out is what local provider will give us good service and the best deal for our usage, which is primarily data, very few, if any, calls. Ideally I'd like to get at least 100 mb per day allowance at the low end, and I'd like to not have to pay more than a couple euros per day.
In England I think it was Vodafone, we paid 50 p per day with 1 GB data transfer cap. In Ireland, Vodafone was a much less reasonable 250 MB for 2 euros I think, per day.
Thanks for the help!