In essence, jailbreaking your iDevice means freeing it from the limitations imposed on it by Apple. You install a software application on your computer, and then transfer it to your iPhone, where it "breaks open" the iDevice's file system to allow you to modify it. Simple as that.
Why would I want to jailbreak my Apple iDevice?
It lets you do everything from customizing the look of your iDevice to installing third-party applications (such as titles that are not authorized and available in the AppStore) and customized ringtones on it. Depending on how far you're willing to go, you can do even more than that because jailbreaking even lets you unlock your phone so you can use it with a carrier other than the one from which you purchased it (if your iPhone is carrier locked).
Once you do it, you're on your own. As long as your iDevice stays jailbroken, you cannot rely on Apple to fix any problems you encounter. All of the applications that jailbreak your phone are unauthorized and could damage or disable your iDevice until you fully restore it from iTunes.
There's a ton of third-party apps available in the Cydia Store once you jailbreak. Some of them are funny, some of them are useful, and plenty of them are awesome. You won't find these kind of apps in the AppStore no matter what.
The jailbreaking tools
These are softwares developed by iDevice hackers all over the world. You can use them for FREE, no costs involved. These softwares are usually available for most systems (Windows, OSX and Linux).
What you must know is that there are a few types of jailbreak methods:
Some of the jailbreak methods work only by putting your iDevice in DFU mode. More on that in future tutorials.
One last thing you should know, is that newer jailbreak solutions are sometimes "tethered jailbreaks" or "semi-tethered jailbreaks" - that means that everytime you run out of battery or you reboot your device, you have to connect it to a computer to "boot tethered". It's the only way it will start again (if you remain jailbroken).
Every jailbroken device can be restored to it's factory defaults using iTunes.
Already jailbroken?Then you have to visit Cydiapp.com to get the latest and best tweaks / themes and mods available for free or payed in the Cydia Store!