Hopefully this hasn't been well covered (search didn't turn anything up, but maybe I missed it). In any case, I am looking to travel to Europe (Iceland, Denmark, and Russia) and I wanted cell service. Questions: Is the best way to do this to buy pre-paid SIMs for each country then swap in and out as needed? What phones are capable of working properly to allow this. Any other information from people who have done something similar would be greatly appreciated.