---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21264#article
headline: "21264: ‘From’ phone number not verified"
url: https://www.twilio.com/docs/api/errors/21264
inLanguage: en
dateModified: 2026-05-06T13:22:30.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21264: ‘From’ phone number not verified

Log Type: APPLICATION

Log Level: ERROR

## Description

You received an inbound phone call to a Twilio phone number owned by your trial account, but the 'From' number is not a [Verified Caller ID](https://support.twilio.com/hc/en-us/articles/223180048-How-to-Add-and-Remove-a-Verified-Phone-Number-or-Caller-ID-with-Twilio) on your account. In order to receive calls to a Twilio number during a free trial, you must first verify your ownership of the phone number that is placing the call. See [Verified recipients](/docs/usage/trials#verified-recipients) for details.

### Possible causes

The 'From' number of the inbound call is not a [Verified Caller ID](https://support.twilio.com/hc/en-us/articles/223180048-How-to-Add-and-Remove-a-Verified-Phone-Number-or-Caller-ID-with-Twilio). Trial accounts can only receive inbound calls from verified phone numbers.

### Possible solutions

You can verify phone numbers from the [phone numbers section](https://www.twilio.com/user/account/phone-numbers) of your account portal.