Problems can cause the iPhone to freeze up or become unresponsive. When the iPhone does not work properly or apps won't quit, a hard reset might help.
Sometimes your iPhone can lock up completely and not respond to any input. In this case, the iPhone can usually be forced to reboot.
On the iPhone 6s, iPhone 6s Plus and earlier models:
- Hold down the sleep/wake button and home button simultaneously.
- Let go when the Apple logo appears and the iPhone is booting up.
Starting with the iPhone 7 this procedure has changed. Click here to see the button combination that resets the iPhone 7, iPhone 7 Plus and later.
This will usually help, however if the iPhone fails to boot you may just see a blank black screen. In this case you might need to restore the iPhone using your computer and iTunes. Follow these instructions to restore your iPhone.