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Document the pay-as-you-go payment-method requirement on the SMS pages #1195

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Document the pay-as-you-go payment-method requirement on the SMS pages #1195

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5 changes: 5 additions & 0 deletions fern/chat/sms-chat.mdx
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Expand Up @@ -22,8 +22,13 @@ SMS chat requires a **10DLC-approved Twilio number**. Only customers can initiat

* A [Vapi account](https://dashboard.vapi.ai/) with an existing assistant
* A **10DLC-approved Twilio phone number** (required for assistant responses)
* On pay-as-you-go plans, a **saved payment method** on your organization (see the note below)
* Basic understanding of phone number management

<Warning>
SMS replies are generated by the Chat API and follow its billing requirements. On a pay-as-you-go plan, your organization needs a saved payment method, and during its first 30 days one completed payment, before Vapi replies to a text. Without them the inbound text is received and a session is created, but no reply is sent and the Dashboard shows no error. Voice calls are not affected. See [Chat troubleshooting](/chat/quickstart#troubleshooting) and [Manage billing and credits](/billing/manage-billing-and-credits).
</Warning>

---

## Setup Steps
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1 change: 1 addition & 0 deletions fern/phone-numbers/inbound-sms.mdx
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Expand Up @@ -23,6 +23,7 @@ When enabled, Vapi configures the Twilio Messaging webhook on your number so inb
- **Twilio number in the US**
- **SMS capability enabled** on that number (in Twilio and in Vapi)
- **US-to-US** messaging only
- On pay-as-you-go plans, a **saved payment method** on your organization, and one completed payment during the organization's first 30 days. Without it, inbound texts are received and a session is created, but no reply is sent and no error is shown. See [Chat troubleshooting](/chat/quickstart#troubleshooting).

## Set up from the Dashboard

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