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They show a message telling you that’s what they’re doing.
Don’t recall ever seeing this message, and I only discovered it because one day the highlight around the icons turned white instead of reverting to grey. They made it more difficult to turn them off, which indicates to me that they want people to keep them on.
@ELbowloh - hard agree on WiFi and bt draining battery.
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You could do a shortcut to switch off both wifi and bluetooth at the same time, then assign that shortcut to double or triple tapping the back of the phone (settings > accessibility > touch > back tap). Just tried it and it works fine
I have the triple tap assigned to screen orientation lock as that’s a mild irritation when watching anything
Apple figured out that most people’s usage of those buttons was akin to “I’m connected to a wi-fi that isn’t working / Bluetooth device I don’t want to be right now, please disconnect me” and changed them accordingly, so when you get to a different wi-fi network it connects to that rather than burning cellular data. They show a message telling you that’s what they’re doing. It’s not a secret.
Turning WiFi / BT fully off has negligible effect on battery life. Privacy is a more valid concern.