The Loop reports:
The Loop has confirmed that if your iPhone has a broken screen and you take it to an Apple retail relocation, they have the capability to fix it on the spot. The machine (think big suction cup), which is located out of customer view in the back of the store, reportedly separates the iPhone from the screen, allowing a new one to be installed.
Of course, your screen doesn’t have to be completely smashed to need some sort of replacement done. Some users have reported dust particles on the inside of the screen as well.