How can I upgrade my iOS version for downloading Netflix?

You probably have iPhone 8, or xe with these you cannot update them any higher. if you have ever downloaded Netflix you can go in the app store to check if it's there, if It is you might be able to download it. although if it's not there you have to buy a newer iPhone, or try some reddit ideas

What model phone do you have?

• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.7

• If you have an iPhone 6S through 7, or SE 1st generation, you can update to 15.8.3

• If you have an iPhone 8 or X, you can update to 16.7.10

• If you have an iPhone SE (2nd generation or later), or XR through 16, you can update to 17.7.1 or 18.1.1

Go to Settings > General > Software Update.

This link will show you how to update your iPhone, iPad, or iPod touch using WiFi -

Update your iPhone or iPad - Apple Support

This link will show you how to update using your computer -

Update iOS on iPhone - Apple Support

Depending on which model iPhone you have, you may not be able to upgrade the iOS. There comes a time when the hardware in an iPhone cannot be upgraded any further. The solution is to buy a new or newer iPhone model.