iPhone 6 iOS 9.2.1 Review
The iPhone 6 is getting older but it's still very sharp.
During our two weeks with the iPhone 6 iOS 9.2.1 update, we've encountered outstanding battery life (full day of use with Wi-Fi/LTE), reliable connections (LTE, Wi-Fi, Bluetooth), stable applications, a smooth and speedy user interface, and a stable environment. We haven't run into any random reboots or freezing on the older model.
Sometimes, iOS updates start to deteriorate on older devices but the iPhone 6's update is still holding up at the two week mark.
We have heard about problems with the aging former flagship but none of the issues we've heard about appear to be widespread.
If you're already on iOS 9, iOS 9.2.1 is a wise choice. It fixes bugs and it brings those security patches we mentioned. These fixes and patches are especially crucial for enterprise users.
If you're on something older, you'll need to be a little more careful. That said, you should come out of the iOS 9.2.1 update without any major headaches if you prepare.