i said that based on my own experience..actually, i have two iPhones (3G & 4)... the iphone 3G that i also bought from here in doha is not factory unlocked and got locked when i accidentally update its OS.. i paid 100QR to unlock it again..so when the iPhone 4 was released last year by vodafone, i immediately purchased it and did not experience anymore the hassle of getting it locked every time i update its OS...