If you are planning to travel to Spain with your
mobile phone, now you can use here the networks of these three companies, these
are the links to the web pages of each one (the are in Spanish...) All three have
a good coverage now. Movistar is the most used, so which has the higher number
of users, and then Vodafone and Amena, but depending on your preferences, basicaly
you can check the prices and services of each one, so you can decide whatever
to use your cell phone: