Use CallSimple inside ChatGPT

The CallSimple app is on its way to ChatGPT's app directory. Until it's listed, you can add it yourself in about two minutes with ChatGPT's developer mode.

You need ChatGPT Plus, Pro, Business, Enterprise or Edu, on chatgpt.com in a browser. Developer mode isn't in the phone apps.

  1. Step 1 · 30 seconds

    Sign in to CallSimple

    Enter your phone number on callsimple.app/call. We call you and read out a 4-digit code. New accounts get 2 free minutes.

    CallSimple
    “Your CallSimple code is four, two, seven, one”
  2. Step 2 · 20 seconds

    Turn on developer mode in ChatGPT

    In ChatGPT, open Settings → Security and login and turn on Developer mode. ChatGPT shows a warning: developer mode lets you add apps that aren't in its directory yet, so it asks you to be sure you trust them.

    Developer mode
  3. Step 3 · 1 minute

    Add CallSimple

    Go to Plugins in ChatGPT and press + to create a developer-mode app. Fill it in like this:

    • Name: CallSimple
    • MCP server URL: the address below
    • Authentication: OAuth
    https://callsimple.app/mcp

    Press Create. ChatGPT opens a CallSimple page: sign in if asked, then press Allow. You're back in ChatGPT with CallSimple connected.

    Connect ChatGPT to CallSimple
    Place calls for you using your minutes. It asks before each call.
    Allow
  4. Step 4 · every time

    Ask ChatGPT to make the call

    In a new chat, press +, choose Developer mode and switch on CallSimple. Then ask in plain words:

    Use CallSimple to call Rahul at 98765 43210. Tell him the shoot moved to 4pm, same place, and ask if that works.

    ChatGPT shows you the number and the message and asks you to confirm. After you confirm, Rahul's phone rings from an Indian +91 number. About a minute later, ask "What did Rahul say?" and ChatGPT fetches his answer, the summary and the transcript.

If something doesn't work

  • No Developer mode switch: use chatgpt.com in a browser, on a Plus, Pro, Business, Enterprise or Edu plan. On Business, an admin may need to allow it.
  • ChatGPT doesn't use CallSimple: say "use CallSimple" in your message, and check it's switched on under + → Developer mode.
  • "You're out of minutes": your 2 free minutes are used up. Paid minute packs open soon.
  • The call didn't go out: calls only go out between 9am and 9pm India time, and each number can be called twice a day.