So, here's how to force a restart on any iPhone ... If you have an older phone, like the iPhone 6 or the first-generation ...

For iPhone 6, iPhone 7, iPhone 8 ... and doesn't power off using the above steps, you can perform a force restart. To do this, press and release the volume up button, then press and release ...

But the way you need to restart or force-restart your iPhone varies depending upon which model you own. 1. Press and hold the Power button (which is either on the top or side, depending on which ...