I used directions in the TripAdvisor forum areas to pre-order a Kolbi sim for Costa Rica to use in my unlocked iPhone 4 for data and voice. Instructions were great!
Now I am traveling in Southern Italy this Spring and would like to do the same thing. I see I can purchase a TIM card in Italy, but would love to have this card in my phone before I go with my pre-paid voice and data plan all set up. Is there a website where I can do this? I've tried the TIM site but it is all in Italian and a bit overwhelming for me.