October 2009 a new batch of iPhone 3Gs came to the market, silently and with a new hardware. I'm talking about the new bootrom for 3Gs, for some it is such a difficulty especially those who wants to unchain from Apples choking and ridiculous policy.
Undoubtedly the Dev-Team has been working on this round the clock or are they? The cat and mouse game can be very tiring, it has been like this since mid 2007 when the first iPhone was born. There are factory unlocked iPhone in the market available to some countries but a country like America where legal unlock is not possible yet they rely on jailbreaking to unlock the device. It has been 3 months now and non of the hackers has come up with a straight forward jailbreak on the latest firmware and exploit on the latest 3gS bootrom.
The Dev-Team's 24kpwn exploit is no longer effective, the iPhone has somehow gain an immunity to it. There are news that Geohot and MuscleNerd has been talking over the irc channel regarding a possible exploit. We'll see what they got in a few weeks or months. For now be wary on upgrading to the new firmware if you care about your unlock.
Read here for the latest news regarding the unlock and jailbreaking.