The focal length information is in 35mm full-frame (FF) field-of-view (FOV) equivalent. The iPhones have a fixed aperture lens. The photographer has manual control of ISO and shutter speed only.
On Apple’s web site, I compared the dimensions of my iPhone 7, the iPhone XR and XS. The iPhone XR is 0.5 inches taller and 0.34 inches wider than the iPhone 7. I had not realized that until yesterday during a text conversation with a friend. The cheaper iPhone XR has a less capable camera but is bigger. Before I upgrade I’ll visit an Apple Store to feel the new iPhones in my hand and how well they fits into pants pockets (dress slacks and jeans).
I am in a similar bind. I am using just over 70 GB of my iPhone 7's 128 GB. The 256 GB is too much for me. But I want to try the new cameras with the photography algorithm. I think I may settle on spending $1149 (US). But not until after December.