How to update my iPhone?
I’m happy how they support
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Go to Settings > General > About
What does it say for iPhone Model and Software Version?
You need an iPhone 6s/6s Plus or newer in order to run iOS 15..
Supported iPhone models - Apple Support
If your iPhone is an iPhone 6/6 Plus or later, then you cannot upgrade beyond iOS 12
have you read thru this support article for updating?
Update your iPhone, iPad, or iPod touch - Apple Support
need more storage for update?
If you need more space for an update on your iPhone, iPad, or iPod touch - Apple Support
issues?
Updating iOS: common issues and solutions - Apple Community
video..