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.