When you put your phone in airplane mode, that's just an API call to the Qualcomm baseband modem ASKING it to stop. You're not really in control of it

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Hi, do you know how GrapheneOS accomplishes disabling the cellular radio by any chance?

https://grapheneos.org/faq#cellular-tracking

Airplane mode sends an api call to baseband modem. But its not a hard kill switch like the libreum 5. The end user would have to manually modify it to do that