In this story, we will learn about how you can reboot the iPhone.
The most probably easiest way to access the reboot is by using the iPhone over the internet.
You can Press and hold both the volume down button and the Sleep/Wake button to get to the Reboot screen release both buttons when apple logo appears.
In case you are not able to do it use the iPhone until you have the battery drained and use it to reboot the device.