For data only (iPad), I can recommend '3'. Available at '3' shops and at Phone House. Excellent coverage. Cant quite remember the rates but not expensive (certainly for Scandinavia). The started pack is especially good value. They have a 50GB for a month plan, which means almost unlimited data. We used one iPad as a personal hotspot and ran all our data needs of it. The only problem is that their website is only in Swedish. So we went to a store to top up at the end of the month.