See:
https://ttlc.intuit.com/community/bugs-and-error-messages/help/why-am-i-getting-601errv-5-custhdr-17...
If you get the error message 601ERRV:5 CustHdr_17 - ? : ? - Invalid SMS Number. Contains invalid digits when trying to e-file your return in TurboTax Online, it means the phone number is invalid or not a U.S. domestic phone number.
You must use a valid, U.S. domestic 10-digit phone number for your SMS text message.
To change your number, sign in to TurboTax, open your return, and select My Info from the left menu . If your number is also added to your account, select Intuit Account from left menu and edit the number there as well.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
