21661: 'From' number is not SMS-capable

This error occurs when the value you pass in From is not a Twilio phone number that can send SMS. If you specify from in <Message>, it must be a message-capable local phone number assigned to your account.

• The From value is a Twilio phone number on your account that does not have SMS capability.
• You specified from in <Message> with a phone number that is not message-capable.
• You purchased or selected a number for another use case, such as voice, without confirming that SMS is enabled for that number.

• Use a Twilio phone number that shows SMS capability and belongs to the account sending the message.
• Buy an SMS-capable Twilio phone number if your current number does not support SMS.
• If you send with a Messaging Service, add at least one phone number or channel address to the Sender Pool, ensure it is SMS-capable, and send with MessagingServiceSid instead of From.

• Messages resource
• Get started with Messaging Services
• Phone Numbers