So things go back and forth. Ultrasn0w has been updated and is even better yet! First, dev team has removed the daemon and used a method more similar to Geohot’s purplesn0w method. However, they did it in a manner that seems safer as it will not corrupt memory and uses less memory. From dev team blog:

To put it into perspective, ultrasn0w uses 152 bytes of properly malloc’d baseband RAM, which is 0.015% of what purplesn0w uses. Put another way, purplesn0w uses 6900 times more RAM than ultrasn0w (and doesn’t let the O/S know that it’s using it, so the O/S still thinks it’s free to use. When it does use it, the baseband will crash).

Also, there is another benefit. This uses mobile substrate to patch CommCenter unlike Geohot’s method which actually patches the CommCenter file. The benefit of this is that you are not modifying your system files and it is very easy to uninstall safely. You could probably just disable it with SBSettings mobile substrate menu as well.

I consider the current ultrasn0w the recommended unlock.

Edit: dev team announced a 3.0 software unlock, so these sim adapters may become irrelevant again. I have discontinued sales of them waiting for the new release.

I have spent some time researching options for all of us on 3g iPhones with a 2.30 baseband that cannot be downgraded. Yellowsn0w is not working for these devices, and if Fuzzy cannot downgrade your baseband, you are stuck with using a sim adapter. Unfortunately, not all sim adapters are the same. In fact, many are unstable and drop signal regularly. I have done some testing on various sim adapters and am pleased to report that the Gevey3g sim works very well and hasn’t dropped my TMobile signal once yet.

The sim does not require any sim card cutting, seems to offer full signal strength, and seems stable. It requires you enable data roaming if you want to get data (EDGE is all that’s offered here on TMobile USA).

In the process of my testing, I contacted Gevey3g and managed to get a small shipment of these sim adapters. They sell for $49.99 + shipping from gevey3g.com, but I’m offering them for a substantial discount to anyone that needs them (less than half price). Mind you, I am not trying to make a business of selling these and am only doing this to help out, because sim adapters are otherwise hit and miss. If you can find these for cheaper elsewhere, by all means feel free to buy them from someone else. I’m only offering a products that I personally tested and can put some level of confidence into selling. Note, I considered not selling these as I have prided my site around giving everything away for free. Therefore, I may stop selling these after the first lot is gone. There are also counterfeit versions of Gevey3g sim (since they seem to be stable) so make sure you are getting the real thing.

If you are interested from buying from me, you can use the google checkout link I have provided. All prices include shipping.

Thanks to the hard work and dedication from the Dev-Team, the iPhone 3G’s software unlock solution is near completion and quite stable. I have been following forum posts from hackintosh, modmyi, and howardforums and the consensus is pretty clear it works for 95% of the people around the world using different types of sims and carriers.

Before yellowsn0w, I used the “Virgin-Sim” sim proxy, and it worked quite well with T-mobile USA. When yellowsn0w was released on New Years Eve, I disregarded reading any forums and continued to restore my iphone to 2.2 (I was at 2.1) and install yellowsn0w. To my disappointment, it was a pain to get working (multiple reboots, airplane mode toggling, and sim removal and reinsertion).

This news is a few days old, but there is an important message in it so I thought I would post something on it anyway. The dev team is planning to release their 3g unlock on New Years Even 2008. So if you are interested in unlocking your 3g, you must make sure you do [...]