Prepaid data in Sweden
 

If visiting Sweden you might consider buying a prepaid usb deivce to use whilke in Sweden.

Right now a Huawei E1550 (SIM-locked) plus a prepaid data SIM card costs appr. 28 Euro. The package includes one day worth of surfing.

The Comviq Kontant package 28 Euro
Top-ups:
One day surfing 2.70 Euro (max 0,5 GB)
One week surfing 8.10 Euro (max 1 GB)
One month surfing 23 Euro (max 5 GB)

The Huawei E1550 Data Stick is really easy to get unlocked, for free. There are quite a few web pages offering the unlock code.

All big operators in Sweden offer simular packages, but watch out for Telia. They have some strange rules that aren't actually fully clear, yet. Right now they are actually blocking the top-up if you have run out of GBs before the time is up (i.e. a day, a week or a month).