---
page_type: error
code: 21712
message: >-
  21712: Phone Number or Short Code is associated with another Messaging
  Service.
level: ERROR
product: Programmable SMS
---

## Error - 21712

### Phone Number or Short Code is associated with another Messaging Service.

A Twilio phone number or short code can only be associated with one Messaging Service at a time.

Please delete the number from its existing Messaging Service before attempting to add it to a new Messaging Service. [See here](/docs/sms/services/api/phonenumber-resource?code-sample=code-delete-phone-number\&code-language=curl\&code-sdk-version=json) for a code sample. Removing a Twilio number from a Messaging Service will not remove the number from your account.