Unlock scroll bar on broken iPhone? Details below?

There was rumors going around that if you crack the screen on your iPhone / iPod that the scroll bar to unlock the phone will eventually stop working, is this true? And approximately how long till that happens?

Yes it is true and it all depends on the impact of the phone

Not necessarily, if you break it where the unlock scroll bar it and you just leave it then probably yes it will.

Yes and if its not major a day and if it it like 2 hours