> (my bank would never use phone for authienticating a transaction btw, I am not even sure if I updated my phone number with them, they reach me other electroni

> (my bank would never use phone for authienticating a transaction btw, I am not even sure if I updated my phone number with them, they reach me other electronic ways). Phone numbers are often included in billing address inputs, so I imagine it's at least logged in the bank's system and perhaps used as a heuristic signal for fraud.