For you people who have an iPhone; do you jailbreak it? If yes, why do you? If no, why not? I'll start off by saying that yes, I have done it to my iPhone. I kept getting nuisance calls from people trying to sell me things and the iPhone doesn't have a way to deal with that normally. Cydia however has some useful applications for it, including one which I use called CallBlocker. It does what the name says almost - it doesn't block them but it auto-disconnects if I save the number.