How to update iPhone 6s to iOS 15.0
How to update iPhone 6s to iOS 15.0
iPhone 6s, iOS 14
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Your iPhone 6S can be updated to iOS 15.7.3. You cannot update to a version before that.
You can check your current version here:
Settings → General → About
You can download and install software updates here:
Settings → General → Software Update
Remember to connect to Wi-Fi and a charger. Your iPhone must have more than 50% power to update without a charger connected.
You can find more useful information here:
Update your iPhone or iPad - Apple Support
If you want to update your iPhone via a PC or Mac, see here: