yes, indeed, for a week is ok, cause the price of cell phone is greater than a roaming call

you can buy turkish sim, but don´t forget at the same time to do you phone registration, because AVEA sim will work just one week and turkcell as i heard is working longer but still one day you sim will not work in your phone...or you can buy phone, in vodafone shop I found some very simple philips phone for 50 lira.