For iPhone 6s, 6, SE (1st Gen), and Earlier Press and hold the Side Button (or Top button) and the Home Button simultaneously. Standard Shutdown If the Device is Partially Responsive In cases where the screen flickers or shows partial images, you might be able to perform a normal shutdown.
Fix Frozen iPhone Display Permanently
Sometimes, the phone is actually on and processing your inputs, but the display is simply not rendering anything. This feature is usually enabled beforehand but can be activated via iTunes or iCloud if disabled.
Quickly press and release the Volume Down button. Continue holding until the Apple logo lights up the screen.
Permanently Fix Frozen iPhone Display with Forced Restart
Then, press and hold the Side Button until you see the Apple logo. You cannot see the emergency slider, and standard gestures feel impossible to perform.
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