Is anybody familiar with the Copenhagen airport? Is there a place where I could go to there? I'd would be convenient if I could take care of things there..
Well, it would probably be better for you to get a Swedish sim-card... but a Danish would probably work just as fine (as long as people use the country-code calling or texting it).
I think you can get sim cards in a similar fashion there as in Sweden, but I'm not sure.
I think Kastrup Airport has some electronic shop, but not too sure about that either. I doubt they would have cheap unlocked phones there though since airports usually have more expensive and limited products.