I live here for almost 6 months of the year and I have a TMobile UK pay as you go and you can sign up for European network I found it works out cheaper than a greek sim and all the bother that goes with it, plus you top up on line with your debit/credit card and they give me loads of weekend offers.......and in Uk you dont pay for the Sim which you used to have to do here as long as you put 10 pounds on it when you purchase the free sim card and then let them know you need it for overseas via their text messaging system.......and you get good rates on calls overseas......