---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21449#article
headline: "21449: Number already can be used for outgoing calls and messages"
url: https://www.twilio.com/docs/api/errors/21449
inLanguage: en
dateModified: 2025-12-18T21:40:49.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21449: Number already can be used for outgoing calls and messages

Log Level: ERROR

## Description

The number you attempted to add as an Outgoing Caller ID to your account already can be used for outgoing calls and messages.