As the titles says - in times of old, if you needed to force quit an app, you held down the home button for a few seconds and it would quit. Now if you hold down the home button you get Voice Control. So ..... how do you force quit an app?
Hold down the sleep/wake button and when you see the slide to unlock screen push and hold down the homebutton.
Six seconds on the sleep button, then another six on the home button after the "Slide to power off" screen comes up