Since upgrading to iOS 10 I've noticed that often when I want to hang up a call, I now have to unlock the phone, navigate to the phone app to finally press the red "hang up" button.
Previously there would be some basic phone controls like "Mute" and "Hang up" even if the phone decided to lock while you were on the call. Now all I see is the contact information and call duration where the clock would be and "Press home to unlock" on the bottom. No phone controls.
How can I reenable the phone controls on the lock screen?