iOS 7.1 on the iPhone 4 is a step forward, but it's the last one we're likely to get.
We weren't impressed by iOS 7 on the iPhone 4. The Apple A4 that powers the phone is now nearly four years old, and you can feel it from the moment you turn the phone on. It just isn't well-suited to iOS 7's big, sweeping animations and other graphical effects, and its jerky performance is worlds away from what you'd get on a new iPhone 5S, 5C, or even the one-year-newer 4S.
iOS 7.1 is the new operating system's first major update. While there's only so much Apple can do to optimize its software for old hardware, we hoped it would improve the iPhone 4's performance enough to make things pleasant for people squeezing another year out of their phones.
What doesn’t change