---
title: "Changes to Check the opt out status for a recipient phone number with a sender phone number."
method: POST
path: "/sms/optouts:check"
---

# Changes to Check the opt out status for a recipient phone number with a sender phone number.

`POST /sms/optouts:check`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 1 of 5 revisions.

- **2026-07-13** `a402be972bb5` — 2 info

## Changes

- **2026-07-13** `a402be972bb5` — 2 info
  - added the non-success response with the status `400`
  - added the non-success response with the status `401`

---

[Operation](https://skmtc.dev/azure/apis/communication-sms/docs/sms/optouts:check/post.md) · [API](https://skmtc.dev/azure/apis/communication-sms.md) · [Page](https://skmtc.dev/azure/apis/communication-sms/changes/sms/optouts:check/post)