[menage]

One of the advantages of using Google Fi as your phone provider on a Google phone: there's no SIM, and you have to log in to the phone on your Google account in order to transfer phone/SMS service there. So an attacker can't use a SMS hijack to steal 2FA codes unless they've already compromised your Google account (which is hopefully a higher bar than convincing some random phone shop employee).

[e40]

I have an iPhone with Google Fi and I have a SIM. The entire family does and they also have them.

However, the point of needing to login to your Google account is well taken. And I have 2FA on that.