---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21453#article
headline: "21453: Phone number already validated on another account"
url: https://www.twilio.com/docs/api/errors/21453
inLanguage: en
dateModified: 2026-05-06T13:22:30.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21453: Phone number already validated on another account

Log Level: ERROR

## Description

You attempted to verify your phone number to activate your Twilio Free Trial Account, but that phone number is already associated with another Free Trial Account.

### Possible causes

A single verified tester number can be associated with a maximum of 3 accounts globally. The phone number you are trying to verify has already reached this limit.

### Possible solutions

* Use a different phone number to verify your account.
* See [Verified recipients](/docs/usage/trials#verified-recipients) for details on trial verification limits.