Twitter users no longer have to supply a phone number to use two-step verification for authentication. Change will also enable users to maintain better security without divulging more information to Twitter. Previously, Twitter got called out for using phone numbers it had collected for targeted advertising. Change comes as Twitter is pursuing a number of security improvements, including to reduce the number of fake accounts and make the social network less hospitable for disinformation campaigns. Twitter CEO Jack Dorsey’s account was targeted by SIM hijacking attacks, in which attackers take control of a target’s phone number and intercept all two-factor codes that get sent to it.”]
Source: https://www.govinfosecurity.com/twitter-no-longer-wants-phone-number-for-2fa-a-13436