Confirm with ETravelSim support whether this Portugal eSIM extends to the autonomous regions of Madeira and the Azores before purchase, because some Portugal-only travel eSIMs cover the mainland only and not the islands. Both are formally part of Portugal and the EU, but partner network roaming arrangements vary. If covered, expect reliable 4G in Funchal (Madeira), Ponta Delgada (São Miguel), and main island towns. Signal softens in deep volcanic craters, on Pico do Arieiro at high altitude, and in mountainous interior trails — universal across all Portuguese carriers.