[iOS] What is Jailbreaking & Why do I need it?

This article is for iOS devices (iPhone, iPad...), for Android devices you should read 'What is root Android device':

The TheTruthSpy application needs to run silently in the background. It’s necessary to jailbreak your iDevice (iPhone, iPad, iPod Touch) so you can run the silent application in the background. Jailbreaking your phone install automatic Cydia. There is no cost to jailbreaking your iDevice (iPhone, iPad, iPod Touch) and it is completely reversible if the need should ever arise. How to Jailbreak your iDevice (iPhone, iPad, iPod Touch). You can decide which method you want to use. Again, we DO NOT provide support or instructions on how to jailbreak your iDevice (iPhone, iPad, iPod Touch).

The best reference websites for jailbreaking an iDevice (iPhone, iPad, iPod Touch) are:

www.jailbreakmatrix.com 

www.redmondpie.com and

ineed2jailbreak.com