---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/80101#article
headline: "80101: Number Already Added to Another Service"
url: https://www.twilio.com/docs/api/errors/80101
inLanguage: en
dateModified: 2026-03-11T22:03:37.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 80101: Number Already Added to Another Service

Log Type: APPLICATION

Log Level: ERROR

## Description

A phone number can be added in one service at a time.

### Possible causes

Phone Number has already been added to another Service.

### Possible solutions

Add a different phone number or remove the number from the relevant Proxy Service.