Hi everyone, I plan to purchase an iphone4 at Apple store in Vancouver, I will be travelling to HK and China in October, I understand the iphone4 should already been unlocked (since I purchased it from the Apple store not thru my carrier), but I was told the SIM card size will be different in HK/China so I might have problems using my phone overseas. Does anyone have experience using an iphone4 (brought in Canada) in HK or China? Also any experience with Apple's world travel adapter kit, does it worth the money, or should I just buy any adapter in HK? Thanks.