I don't think phones have adjustable apertures actually on their mobile cameras. That being said each camera will have a different aperture and you can exploit

I don't think phones have adjustable apertures actually on their mobile cameras. That being said each camera will have a different aperture and you can exploit this to get real DSLR like bokeh (blurred backgrounds). Basically you want to make sure probably to use real focal lengths (disable digital zoom). This applies to all iPhones and androids. Usually the main (normal) focal length camera will have the largest sensor and best aperture. Have the phone focus on something close and find the closest distance the phone can manage. This will create the biggest background blur. On phones with longer length telephoto this will often also work if you find the closest focus point and do the same process. Depending on the actual focal length to sensor size ratio (and aperture) of the telephoto lens it may either have more or less blur than the main camera. The Ultrawide will usually never have much background blur ability but that is generally true for a real DSLR as well