---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21715#article
headline: "21715: Phone Number Does Not Have Correct Messaging Service Capabilities"
url: https://www.twilio.com/docs/api/errors/21715
inLanguage: en
dateModified: 2026-09-02T14:34:08.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21715: Phone Number Does Not Have Correct Messaging Service Capabilities

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when you try to add a phone number to a Messaging Service and that number doesn't support SMS or MMS. A phone number must have at least one of those capabilities before you can add it to a Messaging Service.

### Possible causes

* The phone number you are trying to add doesn't have SMS or MMS capabilities.
* The phone number type you selected doesn't provide the messaging capability your use case requires. Twilio phone number capabilities vary by number and region.

### Possible solutions

* Check the phone number's capabilities on the **Active Numbers** page in Console before you add it to the Messaging Service.
* Add only a phone number that supports SMS, MMS, or both to your Messaging Service sender pool.
* If you need a different sender, search for an available Twilio number with the required SMS or MMS connectivity and then add that number to the Messaging Service.

#### Additional resources

* [Messaging Services](/docs/messaging/services)
* [Services PhoneNumbers subresource](/docs/messaging/api/phonenumber-resource)
* [Available Phone Numbers API](/docs/phone-numbers/api/availablephonenumber-resource)