How do I blur the background on my iPhone?

Now switch to PORTRAIT MODE. There are amazing settings here, different portrait lighting effects, which you can select here by swiping to the left and right. Portrait mode is a phenomenal function for creating some next-level iPhone pics. It has been designed in a way that creates some jaw-dropping backgrounds. Let’s push the “f” symbol – the smaller the number of the F-Stop (f1.4) the stronger the effect will be -  blurrier the background. The bigger the number the smaller the effect will be.