This page acts as a node in the navigation bar on the left to group all information about Internet access via 2G/3G in Sweden.

The main 3G operators in Sweden are Telia, Tele2, Telenor and Tre (3). Telia and Tele2 share the same network, Telenor and 3 have their own networks.

The cheapest on the go provider is Tre (three (3) in Swedish) with about 10 SEK/MB. The others charge between 15-25 SEK / MB.

It seems that the only operator not requiring registration (and a Swedish id number) is Telenor.

Update 1:

Telia offers a PAYG startpaket at 99 kr (approx £10.00) a week for unlimited 3G surfing. You need to sign up for a full package though, and I think they're only available for Swedish residents (my Swedish father-in-law signed up the paperwork). Each segment lasts 1 week only, then you have to text the word VECKOSURF to 4466 to activate the 3G for another week). The SIM lasts 1 year.

Update 2:

You can get an unlimited prepaid for data from 3 without a Swedish id. The cost is very reasonable
and you can activate a plan for a day, week or month. The only rub is that you (probably)
have to purchase a USB-modem for 900SEK. I'm not 100% sure about the latter. Go to a '3' Boutique
for more details. Could not find info on the web.

I got the modem and all and it works fine.

Update 2.2:

I recently got a prepaid SIM card for 3G internet access from Tre (aka "3") without being a Swedish citizen. I did not have to get the modem, so the SIM cost me 99 SEK (about 10€ or 13USD) and included seven days of unlimited internet access. (They supposingly cap the data speed to GPRS once you reach some data traffic volume which should be somewhere in the several-GB dimension, but I have not seen this and the very friendly and helpful Tre employer could not give me details, either.) I have not tried to top it up, but will try that soon and then update this information, also about using Tre 3G in remote swedish areas. You can get these SIM cards at The Phone Shop, and if they are out of them, you can find them at any Tre booth. I got mine in Stockholm's Gallerian mall next to Sergel torg. (Beware that you need to change the APN in the configuration to net.tre.se if you use the Mac OS X software on the data partition of the modem, since it seems to be set to bredand.tre.se or something by default. They might eventually change this flaw, though.)

Update 3: