Is there a fast way to turn off all comms on an iphone, BUT calls and texts to conserve battery?

I was wondering if there's a one button way to turn off all comms, push notifications etc, except calls and texts(or maybe even calls only) in order to conserve battery?
I also heard of a mode on some Android devices that would also turn your screen black & white and dim it.
Does anyone know if there's some sort of an App or something like that that would allow you to have such functionality?
Cheers

No. You would have to go to notification settings and slide everything off one by one, including badges, banners, show in lock screen etc.

You can turn off celltower data in settings and still receive calls. The bottom line is the screen always consumes most power, so if you are texting then thast consuming power regardless.

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