You all probably already knew this, but I recently discovered "airplane mode" does wonders for battery life. Then again, I'm from a generation old enough to feel no qualms about wandering about with no device whatsoever, so YMMV.
About halfway through my walk I looked at my phone screen and noticed that my phone was still showing cellular bars. It wouldn't communicate and the LTE symbol was gone, but the signal bars remained. Made me wonder what turning cellular off actually meant, was it still connected but data was off? Are the bars just a client side thing and no comms were going out? No idea.
There is no label, it just looks like a cellular icon. When you press it it turns grey, indicating off like this: https://i.redd.it/76b0j4im36f41.jpg
Very intuitive! /s Glad I wasn't doing it for a more serious reason (in which case I would have just left the phone at home, but still..).
edit: comment chain got too deep to reply to. But I think the fact that I failed to see a difference is clear evidence that the airplane mode icon is NOT an adequate indicator.
Airplane mode means turn off all wireless, everyone knows that much. But that isn't what I wanted, I still wanted bluetooth with nothing else and as such turned off the unwanted radios individually.
Airplane mode intuitively to me means just a quicker/easier way to toggle them in one swoop, not a completely different action that you can't accomplish with the individual buttons.
AFAIK both android and ios disables wifi/bluetooth when you turn on airplane mode, but you can turn them back on without exiting airplane mode.
>override the user and activate the mobile radio under exceptional conditions
Not sure about this one, but to my knowledge there isn't any.
Airplane Mode + WiFi back on stops the battery loss from the phone hunting for a tower all day.
Airplane mode will disable all radios but will allow the user to enable WiFi and BT. Some older Androids will keep the Wifi and BT on if you're connected to something though :(