If you are able to sign in to your account using a different verification method then please see below for instructions on how to change your phone number in your TurboTax account.
https://ttlc.intuit.com/community/account-updates/help/how-do-i-update-my-turbotax-account-informati...
If you are completely unable to log into your TurboTax account then please see below for account recovery information.
https://ttlc.intuit.com/community/account-recovery/help/account-recovery-request-for-your-turbotax-a...
