To be fair your phone number is de facto already this
Discussion
You can live quite comfortable with no (e)sim and permanently in airplane mode.
LAN goes a long way an should be preferred because it doesn't expose everybody to RF.
But then WiFi, Bluetooth (bitchat) and Reticulum/Mesh can go a long way.
An esim is perfect in case of an emergency. Else it's just a tracking tool.
Relying on sim is already an anachronism.
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