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

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stephenvapiai merged 2 commits into from
Sep 8, 2026
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Document the pay-as-you-go payment-method requirement on the SMS pages #1195

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0d64b1e
Document the pay-as-you-go payment-method requirement on the SMS pages
chiranjeet-vapi Sep 5, 2026
e35e9d5
style: refine SMS billing requirements
stephenvapiai Sep 8, 2026
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5 changes: 5 additions & 0 deletions fern/chat/sms-chat.mdx
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Expand Up @@ -23,6 +23,11 @@ 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)
* Basic understanding of phone number management
* A **saved payment method** for a pay-as-you-go organization

<Warning>
SMS replies use the Chat API and follow its billing requirements. Pay-as-you-go organizations need a saved payment method and, if they are less than 30 days old, one completed payment. Without these, Vapi receives the inbound SMS message and creates a session but does not send a reply or show an error in the Dashboard. Voice calls are not affected. See [Chat troubleshooting](/chat/quickstart#troubleshooting) and [Manage billing and credits](/billing/manage-billing-and-credits).
</Warning>

---

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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
- **Pay-as-you-go billing:** Pay-as-you-go organizations need a saved payment method and, if they are less than 30 days old, one completed payment. Without these, Vapi receives the inbound SMS message and creates a session but does not send a reply or show an error. See [Chat troubleshooting](/chat/quickstart#troubleshooting).

## Set up from the Dashboard

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