What is the most extreme battery saver method out there? I don't need anything (location, data, nothing) except phone calls when my screen is off. I know of greenify but even that's not good enough
I basically want to turn my android phone into a Nokia 3310 as soon as the screen turns off?
This is not just a question about app suggestion. I'm wondering if it's even possible on android. Google play services would probably not allow this sort of thing.
PS: I have a OnePlus 3 running Nougat.