I have used Yoigo in 2017 was not very good coverage then. No internet connection once you left a city. I've used Vodaphone since and amazed at internet connection almost everywhere along Via de Plata, Norte and LeVante.
My response from prior Sim threads:
May 7, 2022
I'm lazy. From another thread below is my answer. I'm in Spain now. I have the 15 euro Vodafone 50GB internet, 800 minutes of calling to the U.S.,and unlimited calls in Spain. Weird 28 day pre-pay plan. No contract.. no commitments. When you're r done with Spain, stop renewing.. I believe you get some minutes and GB in other EU countries.
When you go to Ireland and Croatia, get another pre-pay cell plan.
Here my answer from another phone thread:
April 27, 2022
"I'm very happy with Vodafone in Spain. 15 euro for 50GB internet, 800 minutes calling time to the United States, unlimited calls in Spain. You get some internet and calls while in France (not exactly sure of the exact details).
No contract. When you are done, stop prepaying. Weird 28 day billing cycle but I deal with it. Prepaying the next billing cycle is easy. Texts are extra few cents per text (weird by U.S. standards).
I had excellent coverage on Via de Plata, Norte, and Levante (I had Yoigo before. Didn't work very well in the hinterlands. I didn't have a phone while on
Camino Frances.). Vodafone does all the technical stuff for you at their local stores. Just make sure you have an unlocked GSM (non Verizon) phone. Easy peasey."