i purchased an iphone 4 last year during the launch from the att store in US. Later upgraded to ver 4.1 (8B117) modem firmware 02.10.04 4 months before I had to move out of US due to job reasons and so paid the penality for contract breakage. Since then the phone is lying idle as i am unable to unlock it. Could you please let me know with the following answers 1. If i upgrade to 4.3.3 what would be my new modem firmware be? 2. If i upgrade to new firmware xx.yy.zz of 4.3.3 version of OS, will i be able to jailbreak and unlock it? 3. If, i am not upgrading the OS to 4.3.3 and remain on 4.1 (02.10.04), how do i jail break and unlock it? Can you please provide some links for this. Appriciate your help.