Will JerrySim work as a solution for iPhone 3G Unlock?
I have recently been thinking that with the new proof that X-Sim, YesSim and others can bypass the sim card checks and allow the iPhone 3G to work on other networks, and a comment by one of the Dev Team “don’t sell your TurboSims Yet”, the Jerry Sim may be making comeback.
I don’t know how many of you have been around long enough to know what a JerrySim is, how it works, or know that this was the one of the catalyst for the entire Dev Team vs Zibri debate - But it was supposed to be the saviour of iPhones with 1.1.2 and 1.1.3 that had bootloader 4.6 that was unlockable until GeoHot went ape shit and unlocked it.
Before that there were StealthSim, UltraSims, XSims, ThisSim and ThatSim. These sim spoofing methods are nothing new to the mobile phone arena. They are available for most phones out there for very cheap. They are not really considered a true unlock and is usually frowned upon by real hackers. The Dev Team certainly wants no part of it based on recent posts on Hackint0sh (which is the official Dev Team forum). This method was the only way that 4.6 bootloader iPhones worked for a long time (those purchased after week 45 with firmware 1.1.2 pre-installed), and those spoof sim manufacturers made ALLOT of money for a few months.
In some cases, like the TurboSim, these writable sim cards are very expensive and others were not very reliable as a long term solution. That’s why some months ago the Dev Team set out to put the __Sim card resellers out of business (or at least provide a free solution to users) by developing software that will allow users to downgrade their bootloader by using cheap USB/Serial port readers/writers and cheap writable Sim Cards with some stealth-like software that they wrote that would take an iPhone from BL 4.6 to Bootloader 3.9.
If you use something called a Silver Card, it can be done allot cheaper than using a TurboSim. With the JerrySim, once you created one, the same card can be used on multiple phones to downgrade the baseband, and then users would have used the AnySim software to unlock their iPhones.
At the same time they didnt want the __SIM manufacturers to be able to capitalize on their hard work developing JerrySIm as well. This is where and when Zibri leaked (and altered) the famous confidential JerrySim document (thats been taken off the Wiki) and got Chris and other members of the Dev Team pissed. Zibri tried to make it look like the Dev Team wanted to sell the JerrySim for porfit - but this was not the case.
Anyhoo - With the new problems facing the Dev Team as they try to unlock the new iPhone 3G Baseband and the new 5.8 Bootloader, maybe the JerrySim may be our ticket to a true software unlock for the iPhone 3G. The Dev Team may be thinking/working on a way to downgrade the iPhone 3G Bootlaoder from 5.8 to 4.6, and thus allowing the new PWNAGE Tool and WinPWN to work. Maybe they have other plans completely, but I think they are up to something.
Recently _Zf (who discovered the JerrySim exploit) along with the help of the members of the Hackinr0sh forum, tried to replicate the results being posted by users around the world that claimed that the TurboSim, once porgrammed correctly, was working with the iPhoen 3G. His latest post hints that he has got some ideas, it it somehow involves this method and some sort of programmable sim card chip..
After some tests, I think this method is too unstable to be worth pursuing - we’re focusing on other ideas now. Sorry for the conclusion but thanks for the testing, and don’t sell your turbo sims yet 
conclusion -> http://www.hackint0sh.org/forum/showthread.php?t=46861
He’s saying that the __Sim methods are a waste but to hold onto your programmable sim chips, maybe we have some JerrySim magic coming our way.
