Talk:European Union/@comment-2001:1284:F01C:D11E:A15A:3581:21D0:58DC-20190117171533/@comment-24682153-20190117194120

no way. Buy one for all. And be careful in Andorra. Buy a local SIM in your first country. And use it for the domestic price in all others. Only Andorra is excluded and at horrendous surcharges. But it's tiny and Spanish antennas cover the most of it.

So check the first country of your trip and go to the chapter of this country in this Wiki. Check whether the provider offers Roam like at home and you are safe for Spain, Italy and Portugal.

BTW for GPS you don't need much data. The GPS signal comes not from the internet. Only the maps that are displayed and possible traffic information. So you can download the maps before and use GPS without any data consumption - but not its "live" features.