What Jailbreak iPhone means?
Developers found out how to break free from the software restrictions that, until now, prevented you from modifying everything on your iPhone, including adding your own custom ringtones.
The developers created a free application that is aptly named Jailbreak, because it breaks open the iPhone’s file system so that you can modify the user interface.
Following video will help you to understand how to jailbreak an iphone:
Check out latest iphone jailbreak apps