iPhone 6s Bug Remains
It's important to know that there is still a widespread iOS 9 bug present on the iOS 9.2.1 update.
The iPhone 6s battery percentage bug is still around and there's a very good chance you'll see it on your device if you do any sort of traveling in the days or weeks ahead.
Apple's working on a solution for the bug but it's not clear when that fix might show up. For now, you're left with a manual fix that may or may not work for you and your iPhone 6s.
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