KNOWLEDGE BASE
Why do I need to have a mobile number on file to reset my debit card PIN?
We need your mobile number (i.e., registered cellular device) to send you a one-time passcode (OTP). This is a six-digit code sent by text message used to verify you and keep your account secure.
See also: What is a registered cellular device and why do I have to have one? and What is a one-time passcode?