In reply to all of you that were wondering. I don't really have much idea about the phones but have had my Iphone Jailbroke by someone else.
The actual process takes about 10 seconds through a computer. It automatically adds an app called Cydia to your phone. Once you've got
this you can do things like change your wallpaper, screensaver, ringtones to pretty much anything you want.
Also, if you download
Installous from Cydia it is basically an app store for free.
I have downloaded Football Manager, Tiger Woods, The Sims, a £70 Sat-Nav,
all for nothing. I mean for Installous it's worth doing it just for that, pretty much never have to pay for an app again.
I haven't gone in to too much detail as like I said I don't no very much but this is what I did know.