Why use an eSIM in Spain?
Spain is rarely a one-city trip. A typical itinerary strings Barcelona and Madrid together with an AVE train, then heads south to Seville, Granada and Córdoba, or out to Mallorca, Ibiza or the Canaries; others come purely for the Costa del Sol or to walk the Camino de Santiago. Every one of those legs leans on data: Renfe tickets on your phone, timed entries to the Alhambra and the Sagrada Família that sell out weeks ahead, Cabify or a taxi app late at night, and maps through medieval lanes where street names are tiled onto walls. Spanish prepaid SIMs are sold at Madrid-Barajas (MAD) and Barcelona-El Prat (BCN) and in city shops, but Spanish law requires the SIM to be registered to your passport at purchase, and airport counters price for a captive audience. A data eSIM is installed before you leave, connects as you land, and rides the same national operators in the Balearics and the Canaries as on the mainland, while your home number stays in the other slot for calls and OTPs.

