Claude Phone Calls: Add OsmO as a Custom Connector

Short answer: Claude takes remote connectors on every plan, including Free (one custom connector). Add OsmO with the address https://api.getosmo.app/mcp, sign in with your mobile number, and Claude can call businesses for you. In Claude Code it is one command.

Customize → Connectors → + Add → Add custom connector, URL https://api.getosmo.app/mcp.

Free plans get one custom connector; paid plans more.

Claude Code: claude mcp add --transport http osmo https://api.getosmo.app/mcp, then /mcp.

How it works

Sign in with your mobile numberYou get 50 free credits. Nothing to pay.
Add OsmO to ClaudeChatGPT, Claude, Grok and other apps that take connectors.
Ask it to callOsmO calls, talks, and tells you what was said.

The full guide

Before you start

Any Claude plan; Free allows one custom connector.
A mobile number from the US, Canada, the UK or Australia (India also works) to receive a sign-in code.
Nothing to pay: you start with 50 free credits.

Connect OsmO to Claude

Open Customize → Connectors, choose + Add, then Add custom connector.
Name it OsmO and paste https://api.getosmo.app/mcp. Leave the advanced OAuth fields empty; OsmO registers Claude automatically.
Choose Connect, enter your mobile number and the texted code on OsmO's page, then approve.
In a new chat, make sure OsmO is switched on in the tools menu and ask Claude for a call.

Team and Enterprise

An owner adds OsmO once under Organization settings → Connectors → Add → Custom → Web. Each member then connects their own OsmO account, so calls and credits stay personal.

Claude Code

Run claude mcp add --transport http osmo https://api.getosmo.app/mcp, start Claude Code and type /mcp to sign in. Claude Code supports both of the sign-in styles OsmO offers (dynamic registration and client metadata documents), so there is no client ID to copy.

Connectors you add on claude.ai also appear in the Claude desktop and mobile apps. Calls are placed from OsmO's servers, not from your device.

Make a first test call

Make your first call a low-stakes one, such as asking a shop for its opening hours. You will see how your AI app confirms the call, how long a call takes and what the answer looks like, before you send it on anything that matters.

If something goes wrong

Common messages and what they mean
What you see	What it means	What to do
"You've used your free OsmO credits"	Not enough credits left for this request (each call needs 3)	Ask for fewer calls at once, or keep calling from the OsmO app: getosmo.app/app
"OsmO can call listed businesses and toll-free numbers"	The number is not a listed business, a toll-free line or one of your saved contacts	Give the business name instead. To call your contacts from your AI app, use the OsmO app, which syncs them
The sign-in page will not take your number	Sign-in accepts US, Canadian, UK, Australian and Indian mobile numbers	Use a mobile number from one of those countries
"Scheduling calls for later is available in the OsmO app"	Calls booked for a later time need the app	Ask for the call now, or schedule it in the OsmO app
A call is refused for the same number	OsmO places at most 5 calls to one number in any 24 hours	Try again once 24 hours have passed since the earliest of those calls

Turn it off

To disconnect, remove OsmO from your AI app's connector settings. Some apps do not tell OsmO when you do that. If you use the OsmO app, also open the Sharing card, then Connect AI apps, and tap Disconnect. If you only use OsmO from AI apps, email [email protected] with the mobile number you signed in with and we will end the access.

Questions people ask

Can Claude call without asking me?

OsmO asks your AI app to read you who it will call and why, and to wait for your yes before it dials. Some apps also ask permission before using a connector at all.

Sources

Checked November 13, 2026. Vendors change their products often; follow the links for the current version.

How to make phone calls from Claude: adding OsmO as a connector