Rovaniemi, Levi or Saariselkä: sizing a Lapland trip
A Christmas trip to Rovaniemi, three or four nights with Santa Claus Village, a husky ride and a reindeer farm, fits in the 3 GB pack, valid for 15 days. A week based in Levi or Saariselkä, flying into Kittilä or Ivalo, is a 5 GB trip: aurora alerts, ski-bus times and the photos you send home in the evening.
Take 10 GB if you share the connection with a tablet in a cabin without reliable wifi, or if you drive between resorts with the map open the whole way. A winter season working at a resort, or a month in Helsinki, calls for 20 GB. The 5, 10 and 20 GB packs last 30 days, so a long stay does not run out of days before it runs out of data. A summer split between Helsinki and a cottage in the Lakeland works out the same way.