I like the iPhone. I really do. But it isn't perfect the way that it comes from the factory. It's got issues with privacy, lack of multitasking ability, and a lack of the ability to customize. This is why so many people are jailbreaking their phones now. Once you jailbreak, you can then fix these problems and more with tools that you can download from the "unofficial app store", Cydia.
Cydia and Installer are the unofficial "App Stores" of the Jailbreak world. Developers create apps and tweaks and different utilities and upload them to these package managers, which organize everything into categories.
The differences between Cydia and the App Store are the lack of an app approval process, and the lack of access limits on the iPhone software - i.e. you can do things Apple did not design the iPhone software to do.
Why Jailbreak iPhone?
First - It removes any and all restrictions that Apple puts on your phone. Of course, you still might not be able to use the phone as a deathray, but if someone created an app for that, you would be able to install it even if Apple didn't want you to. Want to customize your icons? Create a custom, homebrewed app? Jailbreaking is the only way to do it.
Second - To join the community! Apple has a fascist hold on their iPhones. I should say, YOUR iPhones, because YOU paid money for the device. When you get involved with jailbreaking, you'll find a vibrant community of end users out there.
3)Unlock iPhone. To unlock your iPhone and use it on any carrier, you must first Jailbreak your iPhone. Some of the Jailbreak solutions below also allow you to unlock the iPhone, though unlocking is generally beyond the scope of this tutorial.
Are There Any Drawbacks to Unlocking the iPhone?
First - Apple Corp. is good at what it does. For the most part, when they've disabled functions on the iPhone, it's because those functions are not ready for prime time. For instance, once you jailbreak, you can enable multitasking. Apple disabled this for a good reason - it's a huge drain on the battery. So if you don't want to worry about stuff like that, just leave your phone as it is.
2)Jailbreak could (maybe?) brick your iPhone.
Third - You can't update your phone with new releases of iTunes. New releases might have cool new features, but they also contain patches that will "un-jailbreak" your phone.
Fourth - The minute that you jailbreak your iPhone, the warranty is null and void. So if you accidentally brick it, or even drop it or something - you are on your own and stuck paying for any repairs out of pocket.
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