My parents are going to Spain this weekend and I hope to let them use my unlocked iPhone to connect over there, and share a data connection. I initially started with Vodafone, because that seemed like the best deal, but now I realize that going with someone like Movistar might be smarter since they have experience selling the iPhone. So while I'm technical, my parents are not. Can someone tell me what is the SIMPLEST way to get an iPhone working on a prepaid data plan over there? The voice calls don't mean much, but data is everything. If you know it, please include how much it costs per day to use data, and how much data you get for that price. I learned how important those questions are when using it in London and Dublin. Thanks!