Today we’ve confirmed that Canadian users now has access to the feature, while we’ve also received tips from users in Argentina & Pakistan signalling that the feature is beginning to roll out in other countries as well. Mexico, Netherlands, Russia, Austria, Brazil, Belgium, Portugal, & Poland too. Let us know in the comments if the feature is now available in your country.
Apple introduced two-step verification in March due to security concerns with its password reset. When you set up two-step verification, you register one or more trusted devices. A trusted device is a device you control that can receive 4-digit verification codes using either Find My iPhone notifications or SMS to verify your identity.
You can add two-step verification to your account by visiting the link below. Select "Manage your Apple ID", sign in, select "Password and Security", then click "Get Started" under "Two-Step Verification".