I am using our shiny new Twilio Test account for the first time via CiviCRM and it doesn't go out.
"The From phone number +12395995225 is not a valid, SMS capable inbound phone number or short code for your account. For more information, see https://www.twilio.com/docs/errors/21606"
The receiving phone number has been verified and using API calls via Twilio site works.
What would be a good way to troubleshoot this?