Catalyx on "[Plugin: Wordfence Security] Which Countries does WordFence Premium Support for Two-Step Verification?"

WordFence FAQs state:

Wordfence Security provides two-factor authentication (Cellphone Sign-in) for paid members.

Which countries are supported with this feature and what, if any, technical or service requirements are necessary for despatching SMSs? This query assumes, of course, a premium API is purchased.

Thanks.

https://wordpress.org/plugins/wordfence/