Get it replaced by Apple
Getting your screen replaced by Apple is easy and surprisingly cheap — possibly even free, depending on the type of damage and whether you’re still under warranty.
Get it replaced by a third party
You don’t have to go to Apple to get your screen repaired, but going anywhere else will void your warranty (and trust me, Apple can tell if a non-Apple employee has opened up your phone). But if you’re out of warranty anyway, there’s no shortage of third-party Apple repair places eager to get their hands on your shattered screen.
Replace it yourself
There are plenty of videos that will show you how to remove the broken screen, move all the parts (ear piece, home button, digitizer) to the new screen, and then pop the new screen in, all in under 5 minutes.
Deal with it
If you’re really short on cash, and taking apart your iPhone 6 scares you, you can also just opt to…live with a broken screen. It won’t look pretty, but you don’t need to replace your screen when it cracks, especially if the cracks are around the edges of the screen and don’t interfere with actually using the phone. If you have one or two large cracks that run across the screen, I suggest looking into a glass screen protector such as Tech Armor’s Edge to Edge HD Clear Ballistic Glass screen protector ($19.95) or Zagg’s glass screen protector ($39.99) so you don’t cut your fingers as you swipe. (If your screen is absolutely shattered, a glass screen protector will keep you from getting cut, but your phone may still be unusable.)