Mobile or Cellular Phones
If you have a cellular phone (GSM with a small SIM-card) you can easily buy a refill card in Sweden. The cards vary between SEK 250-750.
You might want to bring your own computer as many rooms have a direct Internet connection. You will need a network adapter/card of Ethernet standard 10 MB or 100 MB and a TP-cable of Category 5.
If you do not have a computer or prefer not to bring it you can use the computer facilities on campus.