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.
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.