Visiting Madrid soon and flying to Adolfo Suarez Barajas Airport? If you want to save on high roaming charges Traveltomtom recommends you to get a prepaid sim card for Spain. Don't get fooled by slow overseas data roaming plans, they are expensive and reduce the data speed. It is 2023 and we want 5G! This is a complete guide for buying a sim card at Madrid Airport. Where to get a sim card, up to date prices as per March 2023, my recommendation and even info about international and e-sim cards for Spain.