Who Cares?
Third-party Jailbreak Apps and Tweaks. Probably one of the best reasons why you should jailbreak your device is the plethora of jailbreak tweaks and apps that are available to you through Cydia. Most of the apps and tweaks that are found in Cydia can't be availed through the App Store. Some of these applications can tweak certain aspects of your device while there are those that completely changes the look and feel of your device. Some of the most awesome jailbreak apps that you can download are SBSettings, 3G Unrestrictor, Springtomize, BiteSMS, Infinifolders, IntelliScreenX and more.
Unlock your iPhone
Unlock Your iPhone. Some folks buy their iPhones from another country and then bring it into their own. But since the phone is usually tied down to a carrier, one would need to unlock it first so it can be used for any carrier. If you jailbreak your device, you will be able to install a jailbreak app called Ultrasn0w and unlock your iPhone so you can use the carrier of your choice. Although there is another unlock method that requires you to purchase an interposer SIM and it doesn't require a jailbreak.
Full Customization
By jailbreaking your device, you will be able to fully customize your iOS device. iOS simply isn't known for its customizability. There is a jailbreak app called Winterboard that allows you to completely change the theme of iOS or for a more advanced solution, you can try Dreamboard. You can also customize the look of your lockscreen, Springboard, music player, slide to unlock bar, Notification Center and so on. With a jailbreak, you will be able to customize your device to a degree where you can really call it your own.
The Process is Quick, Easy and Reversible
As the years went by, jailbreak developers have working hard to provide the easiest jailbreak solutions. These days, it will only take a few clicks before you can jailbreak your device. The only tricky part is placing your device in DFU mode and even that is not that hard to perform. Even complete newbies can jailbreak their devices with ease. After jailbreaking, should you decide that it is not for you, you can always reverse the process by restoring your iDevice through iTunes.