This happened to me. My T-Mobile number was ported to a hacker and they used it to get control of my GMail account. They then tried to use that to get at my C

This happened to me. My T-Mobile number was ported to a hacker and they used it to get control of my GMail account. They then tried to use that to get at my Coinbase account. Luckily I had device 2FA enabled on that account so when they realized they couldn’t get in they gave up. Meanwhile though my Google account which has everything was inaccessible to me. Getting back control of your gmail when all your 2FA and device codes have been reset is very difficult. I had to call in a favor with a friend who worked there. I use true 2FA on all my accounts now. One thing you can do is call T-Mobile and setup a pass phrase. Phone based customer service won’t do anything for you until you give them that pass phrase.