Social Security - Why couldn't my phone number be verified? As part of the identity verification process, we use the physical possession of a phone in your name to verify that you are you—and not a fraudster pretending to be you. Related articles Why can't my phone number be verified? Veterans Affairs - How do I change the phone number I use for multi-factor authentication? Veterans Affairs - Why couldn't my phone number be verified? Allscripts - What happens to my MFA when I change my phone? Social Security - Why do I need to submit a "selfie"?