Press and quickly release the Volume Up button (the top button on the left side of the phone). This is a quick tap — not a hold.
Immediately after, press and quickly release the Volume Down button (the lower button on the left side). Again, a quick tap.
Now press and hold the Side button (right side of the phone) and keep holding it — even if a power slider appears on screen. Hold until the screen goes black, then the Apple logo appears. Then let go. Your iPhone is restarting.
Press and hold Volume Down (left side) and the Side button (right side) simultaneously. Keep holding both buttons.
Keep holding both buttons for about 10 seconds until the screen goes black and the Apple logo appears. Release both buttons and wait for the phone to boot up.
Press and hold the Home button and the Top button (on older models) or Side button (on iPhone 6/6s) at the same time.
Keep holding both buttons for about 10 seconds. When the Apple logo appears, release and let the phone restart.
Press and hold the Power button on the side of your phone and keep holding it — even if nothing seems to happen at first. On most Android phones, this forces a restart after 10–30 seconds.
The screen will go black, the phone may vibrate briefly, and then the manufacturer logo will appear as it restarts. Release the button when you see the logo.
On Samsung Galaxy phones, press and hold Volume Down and the Side key (power button) simultaneously.
Keep holding both buttons. After about 7–10 seconds the screen will go black and the Samsung logo will appear. Release the buttons and let the phone boot up normally.
If the phone stays black after a force restart, plug in the charging cable. A completely drained battery can cause a phone to appear frozen. Let it charge for at least 15 minutes, then try again.
A faulty cable can prevent charging even when it looks like it's connected. Try a different cable or power adapter to rule this out.
If the phone remains completely unresponsive after charging, there may be a hardware issue. Contact Apple Support for iPhone or your phone manufacturer's support line for Android.
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