Apple this week has greatly expanded the availability of its Apple ID two-step verification, bringing the feature from 11 countries to 59 countries. Two-step verification for Apple IDs uses either iOS’s Find my iPhone application or SMS to provide login verification in addition to a password. The feature first rolled out for both Apple ID and iCloud IDs in early 2013 and it expanded to a few more countries later that year.
When two-step verification rolled out in March, 2013, it was only available in the US, the UK, Australia, Ireland, and New Zealand.
Here’s Apple’s official two step verification FAQ.