iPhone’s “Portrait Mode” is a rather useful feature, and gives neat results. You can even see more and more magazine covers shot on iPhone with the “Portrait Mode”. But, if you don’t like the effect or simply want to add some versatility to it – check out a free app named Focos.
This app lets you add more types of bokeh to the photos you take with your iPhone – from creamy to swirly. The developers promise a “real bokeh effect,” and judging from the sample photos, the bokeh really does look good.