Sure, given an advanced enough device anything is possible. But I think here we are still discussing a "card" form factor for ID? (Being an "unperson" simply because you don't have a smartphone or have a rooted one would be "interesting").

You wouldn't be an "unperson" without a smartphone, but your financial transactions might not be as secure.

Most places with digital IDs use either a phone card reader or the phone’s own NFC terminal to read a contactless smart card. The cryptographic key comes from the smart card, with the phone as a payment terminal.

Nothing advanced is required. And sure, your phone can be hacked, but there’s only so much fearmongering to go around.