The unlocked iPhone 4 is now technically legal and technically possible.
Unlike previous jailbreaks, which required the device to be connected to a computer to run the update, the latest jailbreak is accomplished completely via mobile Safari loaded on the device. The browser-based software bypass reportedly works on all iOS devices, including iPhones, iPads, and iPods running iOS 4 and iOS 4.01, but it will reportedly not work on devices running the iOS 4.1 beta.
Also, some users report the jailbreak disrupts FaceTime and MMS functionality on the device.
However, as of this writing, demand for the jailbreak is apparently so strong that the site's servers can't keep up, and many visitors report difficulty in getting through.
Jailbreaking allows devices to run apps not approved by the company producing the operating system--such as Apple, the main target of such bypasses. Jailbreaking also allows devices to run on nonauthorized networks.
While the U.S. Copyright Office has declared the software legal, Apple discourages users from loading the bypass, reminding them that doing so will void their device's warranty. "As we've said before, the vast majority of customers do not jailbreak their iPhones as this can violate the warranty and can cause the iPhone to become unstable and not work reliably," Apple said in a statement earlier this week.