In the android drop down menu (notification bar), there's an icon for a flashlight. You might have to slide down twice to see it but it's there. No need for a flashlight app because the flashlight is accessible from the notification bar.
How do I turn off/ on flashlight on ZTE Maven? I don't show an app for the flashlight but it came on & I don't know how to turn it off?
If you're phone doesn't have a flashlight app, just install one from Google Play store.