Gotta love the Dev-Team. It seems they never take a break in breaking more and more “legal rules” to give you the iPhone experience you deserve. As of now, ultrasn0w version 1.0-1 is available for download and it brings the advantage of freeing your iPhone 4 or an iOS 4 upgraded iPhone 3Gs and iPhone 3G to work on any GSM carrier. Yeah, that’s right, get this installed and you may swap a shaved T-Mobile SIM Card as long as you don’t mind living on the EDGE.
The baseband specifics are:
– iPhone4 baseband 01.59
– 3G/3GS basebands 04.26.08, 05.11.07, 05.12.01 and 05.13.04
Which is pretty much everything that’s currently available until for now. If you’ve haven’t Jailbroken your iPhone, start with that. If you have problems finding ultrasn0w in cydia, add the repo: repo666.ultrasn0w.com to get it. Here’s a nice how to video if you’re interested..