How to fix an iPhone screen that won't rotate?

Try this, open the control panel by swiping down from top right corner in Home Screen. Look for Wi-Fi icon on top left. Right below the Wi-Fi icon is a curved right arrow with a lock in the center, if it’s on turn off. This prevents iPhone screen from not rotating.

Still, what does not rotate? Provide more details. Not all apps rotate. Which app are you attempting to rotate?

More information here 👉 Rotate the screen on your iPhone or iPod touch

Axel F.