which model of I phone for a small user

The SE 3 model is a small phone, if you prefer small. It’s about the size of an iPhone 7 or 8. It has a Home button.. It’s cheaper than the others but does not support all the latest features and the camera isn’t top notch but it’s good enough if you just want a phone to be a phone. I have one and I like it.

iPhone - Compare Models - Apple

You should go to your local Apple Store or carrier store and try out the various options for yourself. No one here is can see the size of your hands or how you use the phone. Who knows, you may find that you want a larger phone because of the screen size. Or not.