How to unlock an iPhone 3G with iOS 4.1?
There is not yet a conveniently offered iOS 4.1 jailbreak. Your best choice is to jailbreak making use of jailbreakme.com and also remain on 3.1.3. With the baseband in 3.1.3, you can still install ultrasn0w (called for to unlock and also collaborate with any kind of GSM carrier)
Once the iPhone Dev Team has actually released an upgrade to pwnagetool that collaborates with iOS 4.1, it will certainly be secure to update. You can presently unlock iOS 4.1 with redsn0w, yet that DOES NOT permit opening using ultrasn0w.