I was printing 20x30s from the iPhone 5/6 a decade ago. If the craftsmanship of the image was good, there wasn't anything holding me back.
Today, large prints are a given, With recent smart phones, shooting DNG coupled with the newer/larger 48 MP and larger pixel-count sensors along combined with ACR and Topaz AI, even larger images from these smart phones takes little effort.
If you gotta a nice image from your iPhone, indeed print it large!