A simple reboot on the device can frequently solve software-related issues, especially minor ones. Follow these instructions to restart your iPhone 6s:
- Keep holding the Sleep/Wake button down until the red slider appears.
- To turn the iPhone off, move your finger across the slider.
- Hold down the Sleep/Wake button for a few seconds until the Apple logo appears on the screen.
If the restart goes OK, you can attempt force-quitting the app that you believe is causing the problem. Follow these instructions to force an app to shut or quit:
- Go to the main menu and select 'Home.'
- Tap the Home button twice fast from the Home screen.
- Swipe the screen upwards.
If a restart isn't possible, you can instead do a hard reset on your iPhone. To proceed with a hard reset, please use the second approach.
