All fans who register on Ticketmaster are asked to provide a phone number to verify their identity. In addition, existing fans will be prompted to add a phone the next time they log in.
You will be prompted to enter a valid mobile number, and then receive a One Time Password via SMS. Once you enter the code to confirm you are the owner, your phone will be linked to your account and can be used for account recovery, or to verify your identity when you need to make changes to the account.