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You can do this by putting a phone in a faraday cage. A quick search shows various wallet-sized poaches available, but I can't vouch for their effectiveness. I wonder why they're not more popular, nor even mentioned, among all the talk of "hardware switches".

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I have read that if its not in airplane mode, a phone will consume more power trying to establish a connection than a phone that has good signal.

Having a hardware switch is also just more of a usability thing, make it a simple choice to turn off the radios/notifications, don't make me go into settings to have some peace and quiet...

Not a radio engineer, but it's the shape of the Faraday cage that matters I think, not the size. The required shape most likely depends on the wavelength, as the idea is to distort the waves... Basically if your grid is too tight (ie a sheet of metal) the waves keep their shape, but if the grid is too loose, the waves just pass right through.

That's what I've been told by fellow meshnet hobbyists anyhow ;)

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