---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21210#article
headline: "21210: 'From' phone number not verified"
url: https://www.twilio.com/docs/api/errors/21210
inLanguage: en
dateModified: 2026-03-11T18:38:39.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21210: 'From' phone number not verified

Log Type: APPLICATION

Log Level: ERROR

## Description

You attempted to initiate an outbound phone call, but the 'From' number you specified is not a verified number for your account. In order to use a phone number as the Caller ID on outgoing calls, you must first verify your ownership of that phone number.

You can verify phone numbers in the Console [here](https://www.twilio.com/console/phone-numbers/verified).

### Test Credentials

If you received this error while trying to authenticate with your Test Credentials, you probably tried to make a test call with a `From` number from your live account. The only number that can be used to queue `successful` calls with your Test Credentials is `+15005550006`. For more information, read our documentation on [the `From` number for making calls with your test credentials](/docs/iam/test-credentials#test-sms-messages-parameters-From).

### Possible causes

The From number used to make outbound call not a Twilio number or not a verified caller ID

### Possible solutions

[phone number verification on Console](https://www.twilio.com/console/phone-numbers/verified)