I have a 6s . How do I update to 13 or over?
How do I update my 6s+ to a 13 or over update?
iPhone 6s Plus
How do I update my 6s+ to a 13 or over update?
iPhone 6s Plus
Assuming it is actually a 6S Plus, see: Update your iPhone, iPad, or iPod touch - Apple Support
If the device is at iOS 12.5, it is not a 6S Plus.
Assuming it is actually a 6S Plus, see: Update your iPhone, iPad, or iPod touch - Apple Support
If the device is at iOS 12.5, it is not a 6S Plus.
This article can help you out in updating your iOS: Update your iPhone, iPad, or iPod touch - Apple Support
See:
How do I verify that it is a 6S+?
You could check the model at: Settings - General - About - Model = ???
Or check the version of iOS at: Settings - General - About - Version = ???
What is the difference between a 6+ and a 6s+?
I have a 6s . How do I update to 13 or over?