For physical damage please give the phone to the front desk and they will contact Mantis Support.
First try hard restarting the phone for all glitches
Step 1: hard reset your device, press and hold the Sleep/Wake and Home buttons simultaneously for at least ten seconds.Step 2: After about ten seconds, you should see the Apple logo and can release the buttons. That's it. Now you know how to hard reset your iPhone 6s and iPhone 6sPlus.
Step 1: Press and hold the Lock/Wake button on the right side of your iPhone.
Step 2: At the same time, press and hold down the Volume Down button on the left side while keeping the Lock/Wake button pressed.