SIM swap horror story: I’ve lost decades of data and Google won’t help

Thankfully, at the time I still had a Google Fi SIM in a Pixel 3 XL so I called T-Mobile and told them my physical SIM is still in my iPhone and I did NOT authorize any change to my account. Also: Wave of SIM swapping attacks hit US cryptocurrency users 
I was able to get T-Mobile to assign my phone number and service back to my phone by giving them the SIM card ID number and then having them send a text to one of the other four phone numbers in my account where I then read back the verification code. If you have a Google account then I recommend you go into your settings and establish the following in case you need to reset your password on a stolen account:
Google Authenticator
Cell phone number for text code
8-digit backup code
Other phone number associated with your account
Email for recovery
Month and year when you started using Gmail

I had some of this information, but the hacker changed everything in the list above except for one email address that was still controlled by me.

Source: www.zdnet.com