Talk:European Union/@comment-2A02:120B:2C64:2150:6914:3775:302F:4546-20180209165746/@comment-49.184.165.87-20180210001758

Well, all of these countries that you have mentioned belong to the EU. So you can take most EU SIM cards and use it according to Roam like at Home at domestic prices without surcharges.

Normally, we suggest to buy a SIM in the 1st EU country and use it in all others to come. For you this would be Portugal. You can do so or wait until you get to Spain as their (domestic and therefore) roaming data are cheaper and you can get up to 30GB per month. Another cheap country on your way is Italy.

Just check the relevant national chapters in this wiki and look at the information given for EU roaming with every provider.