SMS region error

Error Message: "Permission to send an SMS has not been enabled for the region indicated by the 'To' number".
This occurs when trying to send a message to a region not enabled by your Twilio account. As their related help page suggests, if you visit the international SMS settings: https://www.twilio.com/user/account/settings/international/sms, just check all the countries you want to be able to send an SMS to and you won't encounter this error again.