# 21710: Phone Number Already Exists in Messaging Service

Log Type: APPLICATION

Log Level: WARNING

## Description

This warning occurs when you try to add a phone number, short code, or alpha sender ID that's already associated with the same Messaging Service Sender Pool.

### Possible causes

* You sent multiple requests to add the same phone number, short code, or alpha sender ID to the Messaging Service.
* The sender was already added to the Messaging Service at an earlier time.
* Your application retried a previous add request after the sender was already associated with the Service.

### Possible solutions

* If the sender is already associated with the correct Messaging Service, no action is required.
* Check the Messaging Service Sender Pool before retrying the add request.
* If the sender should be recreated, remove the existing phone number, short code, or alpha sender ID from the Messaging Service and then add the sender again.
* Update your application logic to avoid sending duplicate create requests for the same sender.

#### Additional resources

* [Services PhoneNumbers subresource](/docs/messaging/api/phonenumber-resource)
* [ShortCodes subresource](/docs/messaging/api/services-shortcode-resource)
* [AlphaSenders subresource](/docs/messaging/api/alphasender-resource)