Update iPhone 6s Plus to iOS15
Update iOS 12.5.7 to iOS 15.8 on iPhone 6s Plus
Earlier iPhone models
Update iOS 12.5.7 to iOS 15.8 on iPhone 6s Plus
Earlier iPhone models
There isn't a 12.7. If you're referring to 12.4.7 or 12.5.7, your unit isn't an iPhone 6s Plus or capable of 13 or above; otherwise, use a computer or the Software Update function in Settings.
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Update from iOS 12.5 to iOS 15.8 on iPhone 6s Plus
Yes
Update iPhone 6s Plus to iOS15