If you have an older iPhone that can't upgrade to iOS 12.2, you'll have to do a little more sleuthing. You won't see an entry for the model name, but you will have a model number. However ...

But as it happens, the 32GB model is much slower than the bigger models at a number of real-world tasks. Hilsenteger begins by testing the 32GB iPhone 7 against the 128GB model in disk benchmarks.

That's not a problem, though, because you can quickly find out your model name and model number in your iPhone's Settings app.