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There are also several other smaller carriers including Halebob and DJuice.
Many USA carriers such as T-Mobile, Sprint, AT&T and Verizon have roaming agreements in Sweden. However, your phone must be able to function on the GSM 900 and 1800 Mhz networks. Most AT&T and T-Mobile phones will while few Sprint, Verizon and other carriers will. Still, it is less expensive to go to Sweden and buy a pay as you go SIM card and cell phone or, if your phone does already work, you can have it unlocked (ask the carrier for the unlock code so you can use different SIM cards with the phone). You can also buy Swedish SIM cards and SIM cards that work in Sweden, like the National Geographic Travel SIM .