Hi everyone, first of all thank you very much for all the help earlier for jailbreaking my iPhone 4. Now I am trying to unlock it but I wonder if the iPhone I got can be unlocked. I bought 2 iPhone 2 months ago and it came with 4.2.1. The one I got has a part no. MC608LL/A with serial no. starting 88050HL, but the one my wife got has part no. MC318LL/A with serial no. starting 80049C5. Just wonder if anyone knows if these iPhones can be unlocked? I tried looking around in the forum and found that even an iPhone 4.2.1 can be jailbroken doesn't mean it can be unlocked as it depends when the iPhone was purchased. Thanks for helping me out again and hope to unlock these devices.