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  1. Have you setup your Twilio/Nexmo account in CAS?

  2. Is Twilio (or Nexmo) experiencing outages? Check their API status:

    1. Twilio:

    2. Nexmo (now: Vonage):

  3. Is the target phone capable of receiving SMS messages?

    1. Seems obvious, but a test SMS would eliminate it as a possibility.

    2. Are other phones receiving SMS' as expected? It’s the number (or their carrier)!

  4. Have you recently changed your Twilio or Nexmo account settings? Something may be amiss there.

  5. Is your Twilio (or Nexmo) account active?

    1. Check your Twilio/Nexmo account status.

    2. More info about Twilio accounts here: