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If a call comes in that you're not expecting, you will not have time to blur your background beforehand, but you can still enable Portrait Mode after you answer your call.

Set up Portrait Mode when you receive a call

Step 4: Swipe up to close the Control Center, if needed. Step 3: Tap to turn on the Portrait button. Step 2: Launch the Control Center by swiping down from the top right of your iPhone screen and tap the Video Effects button. Step 1: Launch the FaceTime app in preparation for a call. Unless you expand your view of yourself, you won't see too much difference in your appearance when Portrait mode is enabled, but the person on the other end of the call will see your environment faintly blurred, just like in a Portrait mode photo. If you’re the one making the FaceTime call, you can prepare ahead of time by enabling Portrait mode. Set up Portrait Mode if you are the caller
