I did make some experiences with 3.dk last week. I used my 3.uk.co SIM card and it was just perfect. No problems, no hassle.

I used the daily net access for 50 Pence, fring was working well, just the VoipBuster Java application was blocked by three. But SIP access to my Poivy account through fring was no problem.

Internet was also no problem, even the JoikuSpot worked.