There is no phone support for free unless you upgrade to PLUS.
You can ask your question here, but do not post any personal information to this public forum.
If you are using a paid version or have added Plus then:
There is no single published number because it changes contently depending on the nature of the call and agent availability. Following the link below will either give a current number for you to call or take your number for a callback.
Here is a TurboTax FAQ for contacting customer support.
https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number