RS tour September. Have read many reports of bad experiences in buying SIM cards at the airport. Staying at Hotel Jazz. Nearby Vodafone or Orange cellular stores? Did they charge you to set up SIM card for unlocked iPhone? Gracias
Google maps shows a Vodafone store a couple blocks from your hotel at Carrer de Pelai, 48. It also shows an Orange office at Ronda de la Universitat, 22. It too is a couple blocks from your hotel.
This blog has more information about Spanish pre-paid SIM cards.