---
title: "SMS Setup"
slug: "sms-setup"
status: "update"
updated: 2026-01-07T12:27:03Z
published: 2026-01-07T12:27:03Z
canonical: "docs.mapp.com/sms-setup"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mapp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# SMS Setup

This section explains how to configure SMS messaging in your Engage system — including provider setup, sender IDs, subscription workflows, and technical requirements.

Before you can send SMS messages, the feature must be activated in your account and connected to a supported SMS service provider. Work with your Customer Success Manager to determine the best setup for your needs.

When setting up SMS messaging, there are a few key questions to clarify:

1. **Which type of sender ID do you plan to use?**

> [!NOTE]
> Note
> 
> The selected sender ID determines whether inbound SMS replies are supported. Alphanumeric sender IDs are outbound-only and do not allow replies. Inbound SMS, keywords, and subscriptions require a numeric sender ID.
> 
> For details, see [Sender IDs and SMS Numbers](/v1/docs/sender-ids-and-sms-numbers).

For details, see [SMS Code Types](https://docs.mapp.com/v1/docs/sms-code-types)
  1. Shared short code with a keyword
  2. Dedicated short code
  3. Dedicated long number
2. **How can contacts subscribe?**
  - By sending an SMS message
  - By signing up on a website or in-store
3. **How can contacts unsubscribe?**
  - By sending an SMS message
  - By changing preferences on a website
4. **Will replies be supported (Inbound Messages)?**
  - Decide whether subscribers are allowed to respond to your SMS messages
  - Use Inbound Messages and automations to process replies such as “STOP” or coupon codes