---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21404#article
headline: "21404: Inbound Phone number not available to trial account"
url: https://www.twilio.com/docs/api/errors/21404
inLanguage: en
dateModified: 2026-05-06T13:22:30.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21404: Inbound Phone number not available to trial account

Log Level: ERROR

## Description

Purchasing phone numbers is a feature that is only available for upgraded accounts.

### Possible causes

You attempted to purchase a phone number using the REST API while on a trial account.

### Possible solutions

[Upgrade your account](/docs/usage/trials#upgrade-your-account) in order to purchase numbers.