iphone 4g 4.1
my iphone 4g 4.1 not work network service after jailbreak
ultrasn0w not work this version
Check your Modem Firmware (Settings > General > About). If it is 2.10.04, sorry, you have to wait.
What Tamagochi said is correct. As mentioned many times on this board, as well as by the dev-team -- iOS 4.1 includes a baseband update that makes the phone presently unlockable. There is no ETA for an unlock for this firmware. Best bet now is to get your 4.1 SHSH on file using TinyUmbrella and then wait for the next unlock for either 4.2 or higher.
Originally Posted by renishpatel
Also, it has been stated that an unlock should be possible for 3G and 3GS iPhones running iOS 4.1. As you have an iPhone 4, this might not help you. The iPhone Dev Team have been very silent on if this forthcoming unlock will also work on the iPhone 4
Originally Posted by n1ckn4m3