Later model iphones (7-plus and onward) have a "portrait mode." This is a setting that uses gobs of processing power to simulate a very shallow depth of field. It may work by assuming that the thing you want in focus is in the middle of the frame; not sure.
Phones have to do this with digital effects because they have very small sensors, which require a very short focal length lens, which because of physics is going give huge depth of field (unless the lens has a wider maximum aperture than anyone wants to pay for). So the phone takes a picture that's sharp corner to corner, and then throws alogrithms and processing power (and maybe some AI) at the problem. The result is a vaguely convincing simulation of selective focus with a wide-open lens. The few samples I've seen had a bit of an uncanny, processed look that wasn't too appealing. But people will like it as a shortcut to blurring out distracting backgrounds. You'll have to experiment to see if you like the results with food.
