It's almost impossible to verify the code on the hardware wallet really matches the code they released and that the hardware has not been tampered with.
Maybe the sim card is on a timer to broadcast your keys after a year, so you just can't detect cellular signal usage now.
To securely own bitcoin you have to first create a new chip fabrication plant to then make your own hardware wallet.
Never use someone else's wallet to hold your money.
Not your keys, not your crypto. Use a nice safe hardware wallet. Just check for extra SIM cards first, and audit the key generator.
It's almost impossible to verify the code on the hardware wallet really matches the code they released and that the hardware has not been tampered with.
Maybe the sim card is on a timer to broadcast your keys after a year, so you just can't detect cellular signal usage now.
To securely own bitcoin you have to first create a new chip fabrication plant to then make your own hardware wallet.
It's insane that one has to go through this to be somewhat safe.
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But that lesson does not apply here.