How do I download iOS 14 on my phone

You don't -

• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.5

• If you have an iPhone 6S through 13, you can update to 15.5

Go to Settings > General > Software Update.

Update your iPhone, iPad, or iPod touch using WiFi -

Update your iPhone, iPad, or iPod touch - Apple Support

Update using your computer -

Update iOS on iPhone - Apple Support

Make sure that you're on a WiFi connection or have access to a computer:

Update iOS on iPhone - Apple Support

I want to download iOS 14

how do I update my iOS 14.0 on my phone