---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/20021#article
headline: "20021: Phone number rejected by T-Mobile SDG Service Provisioning API"
url: https://www.twilio.com/docs/api/errors/20021
inLanguage: en
dateModified: 2026-03-11T18:38:39.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 20021: Phone number rejected by T-Mobile SDG Service Provisioning API

Log Type: APPLICATION

Log Level: ERROR

## Description

Exception received while creating application address in SDG Service Provisioning API: Invalid short code And enum server status is: FAILURE

### Possible causes

* The phone number was rejected by T-Mobile SDG Service Provisioning API

### Possible solutions

* Check the phone number