# How To Build SMS Opt-In Campaigns

> SMS opt-in campaigns (or "text-in campaigns") are great for clients who want to rent billboards or send postcards with an offer that customers can claim…

- Source: https://docs.ghlcustomercare.com/docs/marketing/types-of-workflow-campaigns/how-to-build-sms-opt-in-campaigns
- Section: Marketing / Types of Workflow Campaigns
- Reading time: 1 min
- Images: 1, each explained below

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SMS opt-in campaigns (or "text-in campaigns") are great for clients who want to rent billboards or send postcards with an offer that customers can claim by texting a specific "keyword" back to the location's number.

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The key to SMS opt-in campaigns is your "Customer Replied" Workflow Trigger, which should look something like this:

![Figure 1](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/155008378598/original/nbt6ncD_zxNOuyF5je7eCy1XAW3zuh2Q9A.png)

**Figure 1**

This screenshot appears in "How To Build SMS Opt-In Campaigns". The text alongside this image reads: The key to SMS opt-in campaigns is your "Customer Replied" Workflow Trigger, which should look something like this.
- What this covers: The key to SMS opt-in campaigns is your "Customer Replied" Workflow Trigger, which should look something like this:

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