Those looking to jailbreak and unlock the iPhone 4 won't have to wait much longer. iPhone Dev-Team member Comex has stated he's not waiting for Apple to release iOS 4.1 to launch the latest version of the Spirit jailbreak. The previous version was a one-click solution to jailbreak the iPad running iPhone OS 3.2.
The new jailbreak software will work on all devices running iOS 4, including the iPhone 3G and iPhone 3GS. Comex is working to make sure the free jailbreak utility is up to Dev-Team standards before release, and suggests that users back up their SHSH blobs before jailbreaking.
For those wishing to unlock the iPhone 4 for use on wireless carriers other than AT&T, Dev-Team member PlanetBeing has indicated that a new version of ultrasn0w will be available on Cydia after the jailbreak is released. PlanetBeing has already demonstrated an unlocked US iPhone 4. Two different untethered jailbreak methods were being tested out and the Dev-Team has decided which one will be finalized for public release.
With SHSH blobs backed up iPhone users will be able to downgrade their firmware to earlier versions for jailbreaking in case of an accidental upgrade. The ultrasn0w unlock package can be downloaded and installed using the Cydia manager on a jailbroken device. With ultrasn0w, different SIM cards can be used in the iPhone for GSM wireless networks around the globe.Although jailbreaking makes it possible to run additional software unauthorized by Apple, the process could violate your warranty or terms of service with AT&T. The Dev-Team is expected to release jailbreak and unlock solutions for iOS 4.0.1 within days, not weeks.