Cell phone cameras are far from being ergonomic or "best camera" to use.
They are pretty good and fit in your pocket. Most point & shoot dedicated digital cameras have superior lenses and much better ergonomics... but they end up being another thing to carry when you've got your smartphone, so they are Often left behind (or not purchased).
Smartphones win due to convenience, nice viewing screen and ease of sharing. Not necessarily because of best quality.
They are pretty good and fit in your pocket. Most point & shoot dedicated digital cameras have superior lenses and much better ergonomics... but they end up being another thing to carry when you've got your smartphone, so they are Often left behind (or not purchased).
Smartphones win due to convenience, nice viewing screen and ease of sharing. Not necessarily because of best quality.