> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.agentphone.to/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.agentphone.to/_mcp/server.

# Sim.ai

> Add AgentPhone tools to the AI agents you build in Sim's visual workflow builder

[Sim](https://sim.ai) is a no-code AI workspace where teams build and deploy AI agents in a visual workflow builder. AgentPhone is a Communication integration there — drop an AgentPhone block into a workflow and your agent can provision numbers, send SMS and iMessage, and place voice calls.

## Setup

1. **Open your workspace** at [sim.ai](https://sim.ai).
2. **Add an AgentPhone block** — drag it onto the workflow builder and paste your AgentPhone API key from [Settings](https://agentphone.ai/settings).
3. **Configure, connect, and run** — pick the tool you need, wire in an AI agent for reasoning, and run. Test a read-only action first. For incoming messages or completed calls, configure a webhook trigger and verify AgentPhone signatures before running downstream actions.

## What you can build

You can combine AgentPhone actions with other workflow steps to build:

* **SMS support line** — provision a number, reply to inbound texts with an agent that pulls answers from context, and log each conversation.
* **Lead call + transcript scoring** — place an outbound call to a new lead, retrieve the transcript, score qualification, and write the result to your CRM.
* **Post-call summary** — after every call, summarize the transcript with action items and update the linked Salesforce or HubSpot record.
* **Appointment reminders** — read upcoming Calendly bookings, text each attendee an AgentPhone reminder, and confirm replies.

## Tools

The [AgentPhone action reference](https://docs.sim.ai/integrations/agentphone) lists the operations exposed inside Sim — numbers (create, list, release), calls (create, list, transcripts), messages (send, react), conversations, contacts, and usage. Each runs as a step inside an AI agent block, so an agent can chain AgentPhone with other integrations and apply LLM reasoning between steps.

[Start building on Sim →](https://sim.ai)