You can change your phone number by signing into your online TurboTax account, opening your TurboTax Online software

• Choose a tax return in your account and select Continue to open it.
• Then navigate to the Account Settings section directly above the Sign Out option
• select Sign-in & security

For more information, please click:
TurboTax How do I update my TurboTax Online account info?

Thank you for choosing TurboTax.

Sign in to your TurboTax account and follow the instructions listed below to update your telephone number:

1. Sign in to your TurboTax account.
2. Scroll down to select Account Settings in the menu on the left, just above Sign Out.
3. Select Sign-in & Security to update information like your user ID, password, phone number, or email

You can also visit the  TurboTax FAQ How do I update my TurboTax Online account info?

Thank you for choosing TurboTax.