First, open the Settings app. Scroll down and click on the General menu.
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Next, tap on Accessibility.
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Next, scroll down and tap on Switch Control.
Switch Control will be off and Auto Scanning will be on. Tap both switches to reverse this.
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Now, tap on Switches.
There's only one option available at this point, so we might as well go with that.
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Since we want to try out controlling the iPhone with head movements, tap Camera.
I chose to control my phone by tilting my head to the right.
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There are a number of actions you can assign to this simple gesture. For this walkthrough, I decided to assign tilting my head to opening the App Switcher in iOS.
Now it's all set up. You'll notice two blue bars on either side of the screen. These will indicate what iOS thinks you're doing with your head.
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I tilt my head to the right... and App Switcher opens! This'll make multitasking on my iPhone even easier.
Here's what the screen will look like when the iPhone can't see your face.