Prepaid data SIM cards:
Sweden has a good network coverage (even in remote areas) with affordable data plans.
Country information
Of the 4 network operators Telia, Tele2 , Telenor and 3 (Tre), Telia has the best network coverage. In bigger cities and most of southern Sweden all operators are nearly equal as good regarding coverage, but in Northern Sweden Telia is recommended.
Standard European frequency bands are used and all operators offer LTE on their networks.