As per the CRA: You can manage the telephone numbers that the CRA will use if you need to be contacted or for multi-factor authentication by selecting “Profile” and then “edit” under contact information in My Account. If you are unable to sign in to your account, call the CRA to get access.
To change your phone number on TurboTax- Change phone number under Account Settings:
- Sign into your account and click "Take me to my return"
- Select My Account (top of program) then Account Settings from dropdown menu.
- Select the SECURITY tab (on the left under PROFILE)
- Select Edit next to Phone and change your phone number.
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