We tried to fix two phones with cracked and shattered screens: an iPhone 5 and a Samsung Galaxy S3. One of the phones we tried to repair didn't even turn on after we changed screens. The other worked, but only just. Its screen flickered and wasn't as reliable. Once you or a third-party opens your phone, Apple considers any warranty null and void. You need to compare the price of a repair kit to the cost of getting someone else to fix your phone. Once an iPhone is out of warranty, Apple will charge as much as $329 to repair it.