I have an unlocked iPhone and will be traveling to Greece. While in country, I make a lot of calls to restaurants, friends, etc, so I will likely need some kind of a SIM card for Greece while there. What do you guys think is the best way to do this? What do you do while in Greece? It's just so expensive to use my existing plan in Greece. Would I even be better off just getting a burner phone with pay as you go while in Greece and forget about using my phone?