Please see this recent thread for your question about crosswalks: https://accountants-community.intuit.com/questions/1785747-is-it-possible-to-get-rid-of-the-how-many...

As for phone calls, it is not currently an option for 2FA.  Only SMS and email are available.  See the article below for more info.  Personally, I rest easier with 2FA turned on but notice that Intuit doesn't request that every time I log on (probably based on some algorithm).

https://accountants-community.intuit.com/articles/1629619-security-changes-multi-factor-authenticati...