I want to update my iPhone to ios ios 15

Click on a link below for full instructions about how to update with wi-fi or 5G, or using a computer if you have storage or connectivity issues.

Update your iPhone, iPad, or iPod touch wirelessly. Click here --> https://support.apple.com/HT204204

Update your iPhone, iPad, or iPod touch with the Finder [Catalina or later] --> https://support.apple.com/HT212185

Update your iPhone, iPad, or iPod touch with iTunes [Mac Mojave or earlier; Windows] --> https://support.apple.com/HT212186

Or this video:

"How to update your iPhone or iPad" click here --> https://youtu.be/csJAEyvvruY

Go to settings > general > software update. If it’s available for your phone it will show up there.