Geographic permissions, exist to help you protect your application from fraud and abuse, or simply avoid unexpectedly high costs for voice or messaging usage. Geo-Permissions settings allow you to disable numbers from certain countries from receiving voice calls or SMS messages from your Twilio account.
For more information, please see our article International Voice Dialing Geographic Permissions (Geo Permissions) and How They Work.
SMS Geo-Permissions are controlled for your Twilio project in the Console on the Messaging Geographic Permissions page.
For more information, see How International SMS Permissions work.