Fjords, Lofoten or an aurora week: which pack
A long weekend in Oslo, or four or five nights in Tromsø waiting for the northern lights, sits comfortably in the 3 GB pack, valid for 15 days. The classic week from Oslo to Bergen on the Bergen Line, with the detour down the Flåm Railway and a boat on the fjord, is a 5 GB trip: the data goes on tickets, timetables and photos.
A two-week drive from Bergen up to Geiranger, Trollstigen and the Atlantic Road, or a loop of Lofoten with the phone as the car's hotspot, is where 10 GB earns its place. The 5, 10 and 20 GB packs all last 30 days, so a long summer trip does not run out of days before it runs out of data.