Flashlight on Mobile Device or Fake Flashlight

I don’t need dynamic shadows but I’ve read almost all the topics on the forum about “mobile flashlight”, “fake flashlight”, “fake dynamic spotlight” (I still wonder why dynamic point lights are implemented but not spotlight), etc. but unfortunatly I can’t find anything useful.
This iOS game (probably not made with UE4) has a nice flashlight but this look like dynamic spotlight https://youtu.be/qbkqhXofhKA?t=1m7s
I’m looking for something close to this