Just like not your keys not your coins is repeated on the forum, it seems sim swap attack warning/awareness needs to be spread as such.
It is not news again that co-founder of Ethereum Vitalik Buterin had his twitter(X) account
hacked. This lead to a phishing link been posted and many lost their funds.
Now Vitalik himself has come out to said the attack was through his T-Mobile phone number by
sim swap and the hacker got access to his X account through requesting for the authentication through phone number.
Vitalik is one of the most prominent names and personalities in the crypto market, and he is not the only one exposed to a sim swap attack. I can say that many prominent figures like him were exposed to this attack previously, such as Jack Dorsey. The sim swap attack has been common for years. Scammers use it after deceiving the mobile network operators under any pretext to obtain the new SIM cards of prominent and influential people who have accounts containing millions of followers and substantial financial accounts so that they can obtain calls and messages to the victims’s SIM cards so that they can hack their accounts.
What I know is that it is an attack targeting specific people and not a random attack. Also, as the OP mentioned, some signs are easy for anyone subjected to this attack to recognize. Still, he must be on the lookout for his phone, which has a SIM card constantly. He must link his accounts instead of two-factor authentication to the SIM number, which must be done through the Google Authenticator application or YubiKey or GoogleTitan Key.