1. Go to 'Settings'
2. Tap on your name
3. Scroll down and tap 'Sign Out'
4. Enter your Apple ID password when prompted
5. Tap 'Turn Off'
1. Go to Settings > iCloud > Sign Out
2. Tap 'Sign Out' again
3. Then tap 'Delete from [My device]'
4. Enter your Apple ID password when prompted
5. Next go to Settings > iTunes & App Store > Apple ID > Sign Out