With graphene, in airplane mode, there are no pings to cell towers
In general, I would advise against putting a sim card in your phone
when you do that (airplane mode) then no one can call you either. So at the end you will have nice and expensive wi-fi device :-) Just keep that in mind.
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You can do WiFi calling/texting but you're still trusting the mobile network when doing this. If you lack public WiFi then there isn't a lot you can do about this though. You're better off hoping to move people away from these insecure services over time.
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That's a feature, not a bug! Using the GSM (phone) network is a big fat GPS co-ordinate on your location. If you don't want your location shared, don't (ever) use GSM.
Plus phone numbers are insecure (sim swaps, interceptions) and are used to easily identify you across numerous services. It's really time we stopped using phone numbers.
Pixel with graphene works great over wifi, generates a unique mac address for every connection.
The only annoying thing is that airplane mode is not on by default (eg after flashing).
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