I have an unlocked iPhone 5 and would like to purchase a pre-paid data plan SIM to use while traveling in Spain for two weeks. My preference is to purchase this in advance of my arrival in order not to have to track down a store when I get to Madrid UNLESS there is one in the airport.
Some people are recommending purchasing a card on eBay, but I don't know enough to know which offerings are good deals. I am willing to pay more to have the card when I arrive. This forum gave me the perfect information for doing this for a trip to Costa Rica so I'm hoping to get good help again.
Thanks in advance for any advice.