Untethered jailbreak iPhone 4 offers a chance for every user of the iPhone to load just about any application even if the Apple developers have restrictions barring their usage. When the device was first introduced in the market, many people bought the product. They were later to learn that some of the applications they wanted to install were censored.
The best advantage with the untethered version is that it does not require you to connect the device to a computer every time you have to start up the device to use the third party software. You therefore do not lose the software every time you switch the phone off and on. Apple keeps protecting themselves from such intrusion of their operating system with upgrades of the software.
With every release of a jail breaking version, the Apple developers work hard enough to see to it that it does not become successful. When one version is fully protected against, jail breaking developers work hard to introduce another more enhanced version. The latest version is 5.0.1 which also runs on a majority of other devices from the Apple Company.
With the release new iOS versions namely 5.0.2 and 5.1, it has been hard to jailbreak them. The version is the one that runs on iPhone 4S. Up until now it has not been possible to get a jail breaker for the 4S make of the phone. It is a sign that Apple are catching up with the intrusion of their system. On the other hand, the jail breaking software developers are claiming that they are still in the trial phase before they release it.