If you are reading this I am assuming you own a 2nd generation iPhone. What I want to know is how many of you use one of those SIMs that unlock your phone. E.g. Universal SIM, Turbo SIM etc. If any of you do use something like this, could you please tell me how it has worked out for you and have you had any problems and if so, how often? Does the unlock only work temporarily? Does it stop working every now and again? This thread can be very useful to me and others if they are considering buying or unlocked their current iPhone. Thank you.