You can buy styluses for iPhone (or any smartphone) but they have round squishy tips for the capacitive touch screen. They aren't any better than a finger, probably cause the display is tuned for a finger. I only use mine when phone or tablet is on stand.

Apple could put the technology for Apple Pencil in iPhone, but probably not worth the cost for number of people who would use it.

In fact my keyboard is still broken from that "misdetected keyboard button press" bug they introduced some time in iOS26. Gotta see whether that's fixed in 26.3. Embarrassing!

Typical smartphone aspect ratios are too awkward to be great for use with a stylus in my opinion, and is exacerbated by bezels having been all but eliminated.

If I were to design a smartphone for stylus use, I think it'd look something like an iPad mini, with its squarish ratio and thicker bezels, shrunken down by ~20%.