Thanks for the recommendations.
If your phone is not on airplane mode, then the device is constantly transmitting it's unique identifier (IMEI), time, and location, regardless of the sim.
Is this true with Graphene? I didn't get that impression from their docs
yes
even without a sim, it will ping, if airplane mode is not on
graphene really need to enable airplane mode by default, to avoid the pings on startup
to be clear, those "pings" are normal cellular operations, it's just they always contain your identifiers
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