Apple’s two-step verification process is expanding its two-step verification process to more countries.
It’s just an extra safeguard to protect against theft or unauthorized purchases. Users must log into their Apple ID account and enter a four-digit code that’s sent to a trusted device, such as their iPhone.
This isn’t something you’ll have to do every time you make a purchase, but it will add an extra safety net for those who have an Apple ID.
Here’s some information form Apple’s website:
When you sign up for two-step verification for your Apple ID, you can choose an SMS-capable phone number to receive text messages that provide the temporary verification codes Apple uses to verify your identity.
Note: Apple recommends that you have at least one verified SMS-capable phone number.
You can view a full list of countries and supported carriers here.