MR
How to turn on or off your iphone?
iPhone 6, iOS 8.2, Tall
See the quote below from Restart or reset your iPhone, iPad, or iPod touch - Apple Support
How to restart
- Press and hold the Sleep/Wake button until the red slider appears.
- Drag the slider to turn your device completely off.
- After the device turns off, press and hold the Sleep/Wake button again until you see the Apple logo.