iPhone
Take a picture of the iPhone screen
For an iPhone with Face ID (no Home button). With a Home button: press the side button and the Home button at the same time.
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Step 1: Press the side button and the volume up button at the same time.
You will see The screen flashes.
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Step 2: Let go of both buttons right away.
You will see The picture shows for a moment, with tools to mark it up.
If it goes wrong Do not hold the buttons down. Holding them brings up the Emergency SOS slider, and holding longer starts a countdown to call for emergency help.
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Step 3: Open the Photos app to find the picture later.
You will see The newest picture is the one you took.