It is the iPhone!
There two activities: taking snapshots and making photographs. Early camera phones were reasonably good at taking snapshots. The later iPhones have brought creative photography to the pocket of most folks who are interested.
I (Bruce) started pursuing the iPhone as a photographic tool after I got my iPhone 6s Plus. I then took some classes from The iPhone Photography School.
In 2018, I started teaching a class as part of the Summer Citizens program at Utah State University in Logan, UT. It is being offered again in 2019.
This portion of the website is dedicated to the use of the iPhone as a serious photographic tool, including photos taken by his students.