On DSLR camera to do a depth of field is easy to manage by changing the aperture but on smartphones you get little control over your depth of field.
The easy way to take control of your depth of field on your smartphone I recommend to do this..
1. Tell your phones where to focus by tapping on the screen. If you want the foreground in focus, tap on objects or something close to the camera and your backgrond will be blur automaticly.
2. The more objects of your foreground close to the camera and the more somewhat of the background distants. You can definetly get a dept of field and background blur.
By doing so your photos will look good and may be great similar to do it one the expensive DSLR camera.
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