The Twitter account of Twitter CEO Jack Dorsey, known by twitter handle @jack was apparently hacked last friday. The suspected method o fthe account takeover is a SIM swap, whereby attacker intercept the SMS message by changing teh association of SIM card number to different device.
I spent my Saturday morning testing out whether you can fend off SIM swapping hackers by deleting your phone number off Twitter and whether that lets you still keep two-factor authentication on.
Short answer: no.
— Shannon Liao (@Shannon_Liao) August 31, 2019