Todays Twitter for iOS and Android updates let you enroll in login verification and approve login requests directly from your mobile app. By using push messaging and in-application approvals, you no longer need to provide your phone number to use login verification. Backup codes generated in the application can be written down, stored in a safe place, and used to access your account even if you lose your phone. When a login request is made, you will see browser details and approximate location in the app. If you receive an approval request from halfway across the world, you may be getting phished.”]