If your iPhone won't turn off the usual way, you can force restart it with a button combination specific to your iPhone model.

Your iPhone's status bar is a helpful dashboard that provides a glance at the vital signs of your smartphone. You're probably used to seeing the Wi-Fi and cellular data icons in this indicator field, ...

To get your iPhone out of headphone mode, you can try a few troubleshooting tricks, including restarting your iPhone or ...