With the new iPhone XS, XS Max and XR, using Portrait mode, you can invoke Depth Control to change the depth of field after the photo is taken. John shows us how.
depth-of-field
How to Take iPhone XS-style Adjustable Depth of Field Photos on Older iPhones
Here’s how to add the iPhone XS and iPhone XS Max adjustable depth of field effect to your photos on older iPhone models.