The iPhone and the iPad screen rotates almost seamlessly based on how you’re holding it. But if your display is stuck in portrait or landscape orientation, here are a couple of ways to fix it.
Turn Off Orientation Lock on iPhone
If your iPhone display is stuck in portrait and won’t rotate to landscape even when you hold your handset sideways, the Portrait Orientation Lock might be the culprit. Fortunately, we can quickly disable this lock from the iOS Control Center.
If you’re using an iPhone X-style device with a notch, swipe down from the top-right corner of the screen to reveal the Control Center.
If you’re using an iPhone 8 or earlier device with a physical Home button, swipe up from the bottom of the screen to reveal the Control Center.
In the Control Center, spot the icon that looks like a lock with a circle around it. If the Portrait Orientation Lock is enabled, this icon will be shown with a white background. Tap on the “Portrait Orientation Lock” button to disable it.
You’ll see a “Portrait Orientation Lock: Off” message at the top of the Control Center.
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Source : My iPhone or iPad Screen Won’t Rotate. How Do I Fix It?
