---
title: "Add number to SMS registration"
method: POST
path: "/v1/phone-numbers/{id}/sms/reuse-registration"
tags: ["SMS"]
---

# Add number to SMS registration

`POST /v1/phone-numbers/{id}/sms/reuse-registration`

Attaches this number to your existing approved 10DLC campaign instead
of running a fresh registration: the number inherits the campaign's
approval (no new brand or campaign, no extra carrier fee). Enable SMS
on the number first (`POST /v1/phone-numbers/{id}/sms`; its response
tells you whether a reusable registration exists).

## Path parameters

- `id` string, required

## Response `200`

Number added to the existing registration.

- object
  - `registrationId` string
  - `status` 'pending' | 'approved' | 'rejected' | 'requested' | 'changes_requested' | 'deactivated' — requested/changes_requested = pre-submission review states; customers see them as pending / needs changes.

## Other responses

- `401` — Unauthorized
- `404` — Number not found
- `409` — No existing SMS registration to reuse for this number

---

[API](https://skmtc.net/zernio/apis/zernio-api.md) · [All operations](https://skmtc.net/zernio/apis/zernio-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/zernio/zernio-api/revisions/d0ab3b4eb0ae/schema)