If you have already upgraded to 6:15:00 to unlock, there is a baseband downgrade with redsn0w (0.9.15b1). If you downgrade, make sure you have a compatible iPhone 3G (s) as newer models have a fixed baseband. First and foremost, you must check if the iOS version has a lock and base firmware that you are using or downgrade to a supported baseband. But now according to this report from ModMyi forum, iPhone 4 Unlock requires complete rewriting of Ultrasn0w software due to the new baseband OS in iPhone 4.Apple wants to be free slick small patches that recognize if your iPhone is unlocked and these you can destroy the phone and disable it. However, you must enter the lock code, as they only do when you do your device for 50 days enabled on the network and the contract met while your account is in good condition (except for international travel during contract). How To Unlock Any Phone Pattern. com/files/images/stories/2011/06/Unlocked-iPhone.jpg' alt='Can all iphone 4 be unlocked' title='Can all iphone 4 be unlocked'>