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> For a complete documentation index, see https://docs.pinnacle.sh/v-2/changelog/2026/2/19/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.pinnacle.sh/_mcp/server.

## RCS Fallback Messages

Never lose a message again — RCS messages now **automatically fall back to SMS or MMS** when a recipient's device doesn't support RCS.

### What's new?

**RCS fallback messages**

Include a `fallback` object in your RCS send request with a `from` phone number and `text` or `mediaUrls`. If RCS delivery fails, the message is resent as SMS or MMS automatically.

* **SMS fallback** when only `text` is provided (≤3072 characters)
* **MMS fallback** when `mediaUrls` are included or text exceeds 3072 characters
* Original RCS message status updates to `FALLBACK_SENT`
* Webhook delivers `fallbackMessage` details so you can track both legs

[Learn more →](/guides/messages/sending#fallback-messages)

> **Note**
>
> Have questions? Reach out to us - [founders@pinnacle.sh](mailto:founders@pinnacle.sh)

> One API for RCS, iMessage, MMS, and SMS. Build, test, and scale every channel — send your first message in minutes, not weeks.