Is jailbreaking an iPhone, iphone or iPad safe?

For millions of happy users all over the world, the iPhone is fantastic just as it is. It's beautiful, elegant and easy to use, and there are thousands upon thousands of apps and oodles of content for them to choose on the App Store.  

And then there are the people who aren't so happy. People who want to break free of the restrictions they believe Apple has forced upon us all - from the default apps that come with iOS to the fact that its underlying structure cannot be customised by individual programmers, third-party developers or even users themselves.

These unhappy people are the jailbreakers. And Apple has been playing a cat-and-mouse game with them ever since the iPhone launched in January 2007.