Apple released the iPhone 5s in September 2013. But if you still have one, Apple has just defined it as obsolete. So, its repairability has just changed, among other things. Here’s what it means.

To start things off with a bang, the iPhone 6 is powered by an Apple A8 processor, which is 25 percent faster than the iPhone 5S’s A7. The A8 is also 50 percent more energy efficient, and has 50 ...