Whenever I go to Spain I acquire the free Sim card...

Whenever I go to Spain I acquire the free Sim card in the renfe of the Sol station, it is the best option, for 10 they give me 1gb of internet. And they have many more gigas if you wish, the attention is fabulous and they activate the necessary services as well as guide you on how to get to your hotel address etc. The network is vodafone and works perfectly, if you want only calls for 5 they give you 7.50 of balance to call from 1 cent per minute, you can receive calls without cost.

Of course the best option is located the stand in the Renfe of Puerta del Sol. Amazing