The only thing that keeps a modern smartphone’s battery from draining without any signal is “Airplane Mode” or turning it off.
Otherwise it spends a great deal of its battery power looking for cellular and wifi signals.
“Airplane mode” turns off the GPS, which makes the phone fairly useless for most backcountry tasks.
Depends on the phone, my GPS works in airplane mode (since its just a receiver) and OSMAnd lets you download maps for offline use so it doesn't need the cellular radio to get map data.
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