If you find that one of your iPhone apps is hanging and causing your device to stop working, you don't have to reboot it entirely. Here's how to force quit the current app if it stops responding.
If an app is hanging and not letting you return to the home screen, try these steps:
- Press and hold the power button at the top of your device. Wait for the "Slide to Power Off" notification to appear.
- When the red slider appears, release the power button, then press and hold the home button. After a few seconds, the app should close and return you to the home screen.
This function has actually been around forever, though I had never heard of it until a tipster sent it in as a way to "recalibrate" your home button. That tip was pretty much debunked as snake oil long ago, but its original purpose -- force quitting apps -- is actually quite useful, not to mention much quicker than rebooting your phone from scratch.