Tweeting via SMS is an incredibly outdated feature in the modern smart phone era and Jack should have de-linked his account from his phone number a long time ago to prevent this kind of attack. Fucking moron.

The phone number associated with the account was compromised due to a security oversight by the mobile provider. This allowed an unauthorized person to compose and send tweets via text message from the phone number. That issue is now resolved.

— Twitter Comms (@TwitterComms) August 31, 2019