Apple has finally started offering two-factor authentication (2FA) for Apple ID users. An attack on Mat Honans account led to his digital life being laid waste by an internet neer-do-well. Apple has gone an extra mile, making 2FA available to some users in the US, the UK, Australia, Ireland, or New Zealand. It works by sending an SMS to one of a number of mobile devices you have registered with Apple; the message contains a one-time passcode in addition to your regular password.”]
Source: https://nakedsecurity.sophos.com/2013/03/22/apple-introduces-two-factor-verification-for-apple-ids/