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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Discussion

Airplane mode does not stop tracking. Without (e)Sim (profile) still emergency calls possible. Kill switch for baseband only would help. #SS7

Why the high tech?

Chinese Faraday bag costs 5 USD and is guaranteed radio silence.

Cause is useless inside a bag.