How to enable/change Twilio Geo Permissions:

Log in to https://console.twilio.com/

Type geo on the top right search bar

Click on Voice or SMS Geographic Permissions

Select the country here:

Twilio article: 

https://support.twilio.com/hc/en-us/articles/223180168-What-Are-Geographic-Permissions-and-Why-do-They-Exist-