Don't use Phone number based 2Factor or if you must use a number, keep it to an app (eg, Google Voice) and don't forward your Google Voice texts to your phone's number.
Basically, avoid using your carrier provided phone number for anything related to an account.
But Google Voice requires a Google account, and to create a Google account you need to provide a valid phone number. There are also a lot of service providers that don't allow you create an account without providing a valid phone number.
I wonder how high-profile politicians and celebrities deal with security issues like this? If this is really such an easy attack to pull off, what's stopping someone from shilling cryptocurrencies on celebrity social media accounts (again)?
I deleted the phone number from google account, just use 2FA from app. Now forgot password does not give extreme option of just sending a code to my phone.
I mean sending a code VIA SMS. I mean I deleted the phone number from my Google account. Now I have only Auth App, & Google App. The code & recovery options are 8 digit recovery phrase, Tap in Google App on other device. No reset code SMS.
Basically, avoid using your carrier provided phone number for anything related to an account.