For beginners, the easiest way to find how to unlock you phone is by downloading this utility – f0recast (by ih8sn0w)

Click  here to Download NOW !

After downloading :

1. Open the application you downloaded.
2. Plug in your iPhone/iPod.
3. Now the application will tell you, which software you should use for unlocking/jail breaking.
4. Enjoy!

Note. We are not responsible if you brick your Phone.

Why Jail Break ??

Many ask this question to me. Here are the top 5 reasons why people jailbreak their phone :

1. Install 3rd pary applications via Cydia and Installer

The introduction of AppStore in iPhone 2.0 is the best feature for this firmware update, I have to admit. But even with thousands of applications available on AppStore, there are some other great applications, such as Netshare, banned by Apple to hit the Appstore for certain reasons. And this is the place where Cydia and Installer comes in and let you download all 3rd party applications. Some of the great applications you can find on Cydia are:

• Cycorder / Video Recorder – Let you capture video on iPhone
• NemusSync – Sync iPhone calendar with Google Calendar
• MxTube – Download and save YouTube video on iPhone
• iAcces – Let you use all kinds of Chinese Input Method
• iPhoneModem – Let you use iPhone as modem and give your laptop connection to Internet via iPhone
• Mame4iPhone – Play arcade game on iPhone

2. Changing iPhone Looks & Feel

Are you bored with the standard icons that come with iPhone? Ever think of changing the look of iPhone? With jailbreak iPhone, you can use Winterboard to apply theme on iPhone and make it look even cooler. Here are just a few samples to show what Winterboard can do for you:

3. Full control of your iPhone

This may not be the reason for non-tech iPhone user. But for geeks, this may be why you need to jailbreak the iPhone. As you may know, the inner part of iPhone is a trim-down version of Mac OS X, which is actually a Unix core. So, you may wonder whether you can install some Unix applications such as Apache web server, on the iPhone. The answer is yes. With iPhone jailbreak, you can install a lightweight version of HTTP server and other similiar servers. And, one server that most Jailbreak iPhone users are using is a SSH daemon. With SSH, you can connect to iPhone remotely and transfer any file to/from it. Pretty cool, right? You can further refer to this post about how you can use SSH to transfer ringtone to the iPhone.

4. Unlock iPhone

Lastly, the most common reason for jailbreaking iPhone is for unlock. This is one of the mandatory steps you need to through before you can unlock iPhone.

Thanks to :  ih8sn0w and simonblog.com