21212: Invalid 'From' Number

You attempted to initiate an outbound phone call or message, but the From parameter you supplied was not a valid phone number, Alphanumeric Sender ID or approved WhatsApp Sender.

Twilio accepts phone numbers in E.164 format (i.e. "+1 format"), 10-digit US and Canadian numbers with any combination of non-digit separators, or Alphanumeric Sender IDs (SMS only) with up to 11 alphanumeric characters [a-zA-Z0-9]. Refer to this page for acceptable characters.

The number must not be on a do-not-originate (DNO) list, and Alphanumeric Sender IDs may not be generic.

• You have supplied a phone number that was not in E.164 format.
• Your From phone number is on a do-not-originate (DNO) list.
• Your Alphanumeric Sender ID is blocked or too generic.
• You are trying to use an Alphanumeric Sender ID on Trial Account. Trial accounts cannot send from Alphanumeric Sender IDs.
• Your WhatsApp Sender is not approved.
• You attempted to send a message with a From number that has an invalid prefix, using a Messaging Service.

• Ensure your number is formatted in E.164 format.
• Ensure that your From number is assigned and not on a do-not-originate (DNO) list.
• Ensure you are not using an alphanumeric sender ID that is too generic (for example, "SMS" or "INFO").
• If you are getting this error when using a non-generic alphanumeric sender ID, please submit a support ticket for further assistance.
• If you are using an Alphanumeric Sender ID on a Trial Account, upgrade your account.
• If you are using a WhatsApp Sender, check that your sender is approved and that you have followed the onboarding instructions.
• If you are sending messages using a Messaging Service, and you wish to utilize an RCS Agent in your Sender Pool that falls back to SMS, send the message from a MessagingServiceSid.