13224: Dial: Twilio does not support calling this number or the number is invalid

This error occurs when a <Dial> request targets a destination that Twilio cannot route or that is not a valid callable phone number. Format destination numbers in E.164 and verify that the destination is valid and in service before you place the call.

• The destination number is not formatted in E.164, such as a missing + or country code.
• The destination uses a country code, area code, or exchange that does not exist or is not assigned.
• The destination is a premium rate or shared-cost number that Twilio does not support for outbound calling.
• The destination is formatted correctly, but no carrier partner can complete the call because of a local telecom network outage.

• Send the destination number in E.164 format, for example +14155552671.
• Check that the country code, area code, and subscriber number are valid for the destination you want to call.
• Validate the number before you place the call. Use Twilio Lookup to confirm formatting and basic number validity.
• Do not dial premium rate or shared-cost destinations.
• If the number is valid and correctly formatted, try the call again later to rule out a temporary carrier outage.

• TwiML Voice: <Number>
• What is E.164?
• Lookup v2 API