The iPhone is currently one of the most popular smartphones on the market. The first 3 generations were good, but with the release of the iPhone 4, things got even better and people got a renewed interest in the device. With the high resolution, powerful processors and great operating system, people love the iPhone, and it sure isn’t going anywhere soon.
But there are a lot of software limits imposed on the iPhone by Apple, which could (and should) not be there. The most obvious of them is the inability to install certain applications, mostly those that go against the wishes of Apple (like drivers and apps for external keyboards) and the networks through which they sell the phones (like tethering apps on AT&T). There are a lot of users who do not agree with that policy, that’s why some smart developers created the “Jailbreak” process, which unlocks your iPhone (as well as the iPod Touch and iPad), and gives you full access to the OS functions and file system.
Customize the UI and home screen. If you’re tired of the usual icons on a black background, you really have no other choice, as there is no UI customization feature installed on the iPhone. But by jailbreaking, you gain full access to the files system, and that lets you change the icons, backgrounds and Springboard with ease. The best app for doing that is Winterboard, which can be found on the Cydia marketplace (an app store for jailbroken phones, which works in addition to the main one).
Get Internet access on your laptop using your iPhone (via tethering). Of course, your cell network will want you to pay extra for being able to tether your laptop to your phone and have Internet on a big screen on the go. That’s the main reason the iPhone lacks such a feature and apps. Except, there are actually a lot of such apps for jailbroken iPhones, and they’re all great. With them, you can avoid paying the monthly fee for tethering, and use it to buy more bandwidth for your data plan (of course, you’ll have to be careful, as that goes against the network’s ToS).
View useful information on the lock screen. The default iPhone lock screen is basically a wasted space. Would you not rather have it show something useful besides the unlock slider, clock and battery meter? With Intelliscreen, an app only available for jailbroken iPhones, you can display a lot of useful things on the lock screen, for example, the latest emails, Tweets or notifications from any app.
Use FTP, SSH, and transfer files between your iPhone and other devices. If you’re a network or system administrator, you’d probably benefit from having a FTP and SSH client wherever you are, and using a jailbroken iPhone, you can! There are quite a few great SSH, FTP and VPN clients for the iPhone that only work when it’s jailbroken.
While playing around with a jailbroken iPhone is both against Apple’s terms of service and a bit dangerous if you don’t know what you’re doing, it is surely worth it, at least to some people. If you want to be able to use the features listed above, you should really consider jailbreaking your iPhone, especially when it’s so easy to reverse the process and restore the phone without anyone noticing.