GraphenePete
Once it's deactivated, it's untraceable?
Since I am not sure whether you are only concerned about a specific (e)SIM not being seen or whether you are basically concerned about being "untraceable" generally in the mobile network, an additional note:
Only airplane mode reliably turns off cellular radio transmissions and prevents your device from being trackable via cellular radio.
You can find more information here:
https://grapheneos.org/faq#cellular-tracking