I unlocked my 1.0.2 iphone and am using it on tmobile. I'm not sure what unlock I used when I did it, but I remember using paycay. Now I want to upgrade to 1.1.1 and unlock it. I'm just not sure what I need to do. I see some people are having problems with their IMEI getting messed up, how do I check if mine is? Do I just see if the IMEI under settings matches the one on the back of my phone? From what I gather to do the upgrade I need to virginize my 1.0.2 first then upgrade to 1.1.1, jailbreak, and then unlock.