We both have T-Mobile phone plans that work automatically in Europe with no additional charge. It was nice to have data right when we got off the plane. But it is limited to 3G speeds, which is okay but a tad slow. So we went to Vodafone and paid 20 euros for four weeks with 3.5 Gbytes of data. These have worked fine. We are finding 4G coverage almost everywhere on the Norte. Plus every hotel and bar has WiFi, sometimes really fast.