How can I update my iPhone
How can I update my iPhone 6s Plus?
[Edited by Moderator]
iPhone 6s Plus
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Update your iPhone, iPad, or iPod touch
• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.6
• If you have an iPhone 6S through 7, you can update to 15.7
• If you have an iPhone 8 or higher, you can update to 16.0.3
Go to Settings > General > Software Update.
Update your iPhone, iPad, or iPod touch using WiFi -
Update your iPhone or iPad - Apple Support
Update using your computer -
Update iOS on iPhone - Apple Support