What Is Jailbreak

iOS jailbreaking is a process that allows devices running Apple's iOS (also known as iPhone OS prior to iOS 4.0) operating system (such as the iPad, iPhone, iPod Touch, and recently Apple TV) to gain full access (root access) to unlock all features of the said operating system, thereby removing limitations imposed by Apple. Once jailbroken, iOS users are able to download additional applications, extensions and themes that are unavailable through the official Apple App Store, via installers such as Cydia, one of a number of current means for older iPhones. A jailbroken iPad, iPhone or iPod Touch running iOS can still use the App Store and iTunes and other normal functions, such as making telephone calls. Jailbreaking is similar to rooting an Android device.

 There are many reason for jailbreak. Below is the reason : 

1.WIFI Hotspots

As mentioned above, using the iPhone as a Wi-Fi hotspot is still the number one reason to jailbreak the iPhone. Oh sure, you could pay for tethering, but who wants to do that? MyWi is the app to get, and although it's buggy at times, once you get it up and running, you'll wonder how you ever lived without it.

There's a new version of MyWi for the iPhone 4 OS, which you'll need to grab from Cydia. The app is called, simply, MyWi 4.0. Our installation guide for MyWi is here, and for the most part still applies to the 4.0 install and setup.

2.Facetime 3G

Another paid app worth checking out is My3G. This jailbreak app lets you do more things over 3G than you can on an un-jailbroken phone, including using FaceTime, which Apple restricts to Wi-Fi only. My3G users can also download TV shows and podcasts from iTunes over 3G or watch HD YouTube videos.

3.Unlocking The Phone

Unlocking is not the same thing as jailbreaking, although the two terms are often used interchangeably by those not following the issue closely. Jailbreaking allows you to install unapproved third party applications on your iPhone, but unlocking allows you to run the iPhone on a different carrier than its default. (For example, T-Mobile instead of AT&T in the U.S.) A carrier unlock for the iPhone 4 OS is now available as of this week.

4.Block Call & Text

Want to block calls, SMS or MMS messages from someone? The iBlacklist app (a somewhat pricey $11.99) makes that possible. Now iPhone 4/iOS 4 compatible, the app lets you select who to block and also offers parental controls for outgoing calls

5.More Setting & Customization

Go ahead and laugh, Android users, but poor iPhone owners who want to drill down deeper into their settings or further customize their devices beyond wallpaper backgrounds have no choice but to jailbreak. Yet once they do, there are options aplenty. A perennial favorite is SBSetttings, an app that puts quick toggles for the most heavily used features right at your fingertips (just swipe the status bar). Although iOS 4 allows for homescreen backgrounds,Winterboard lets you customize even more options, like the battery indicator and the icons on the lock screen. Other apps, like LockInfo, for example, let you customize your phone's lockscreen to provide info like email and SMS notifications, missed calls, calendar events and more. More plugins are available to add things like weather, Twitter or RSS feeds, and more.

6.Winterboard

Winterboard allows you to customize Springboard of your iPhone. Using Winterboard you can change iPhone icons, customize applications, status bar graphics, iPhone dock graphics, install themes and change wallpapers of your iPhone Springboard. You can even customize sounds on your iPhone. With Winterboard you can theme almost everything that comes to your mind. Before iPhone 2.0 there was Summerboard but Winterboard has replaced it since iPhone 2.0 and can even load themes of Summerboard.